linux.git/net/9p, branch v4.19.145 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git net/9p: validate fds in p9_fd_open 2020-08-11T13:32:32+00:00 Christoph Hellwig hch@lst.de 2020-07-10T08:57:22+00:00 af224c2eeda2bd6679355f588766c5a8da8920a2 [ Upstream commit a39c46067c845a8a2d7144836e9468b7f072343e ] p9_fd_open just fgets file descriptors passed in from userspace, but doesn't verify that they are valid for read or writing. This gets cought down in the VFS when actually attempting a read or write, but a new warning added in linux-next upsets syzcaller. Fix this by just verifying the fds early on. Link: http://lkml.kernel.org/r/20200710085722.435850-1-hch@lst.de Reported-by: syzbot+e6f77e16ff68b2434a2c@syzkaller.appspotmail.com Signed-off-by: Christoph Hellwig <hch@lst.de> [Dominique: amend goto as per Doug Nazar's review] Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit a39c46067c845a8a2d7144836e9468b7f072343e ]

p9_fd_open just fgets file descriptors passed in from userspace, but
doesn't verify that they are valid for read or writing.  This gets
cought down in the VFS when actually attempting a read or write, but
a new warning added in linux-next upsets syzcaller.

Fix this by just verifying the fds early on.

Link: http://lkml.kernel.org/r/20200710085722.435850-1-hch@lst.de
Reported-by: syzbot+e6f77e16ff68b2434a2c@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
[Dominique: amend goto as per Doug Nazar's review]
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read_work 2020-08-05T08:06:01+00:00 Wang Hai wanghai38@huawei.com 2020-06-12T09:08:33+00:00 7271d03240b02053205ee7fa33664a50c3a9d680 commit 74d6a5d5662975aed7f25952f62efbb6f6dadd29 upstream. p9_read_work and p9_fd_cancelled may be called concurrently. In some cases, req->req_list may be deleted by both p9_read_work and p9_fd_cancelled. We can fix it by ignoring replies associated with a cancelled request and ignoring cancelled request if message has been received before lock. Link: http://lkml.kernel.org/r/20200612090833.36149-1-wanghai38@huawei.com Fixes: 60ff779c4abb ("9p: client: remove unused code and any reference to "cancelled" function") Cc: <stable@vger.kernel.org> # v3.12+ Reported-by: syzbot+77a25acfa0382e06ab23@syzkaller.appspotmail.com Signed-off-by: Wang Hai <wanghai38@huawei.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 74d6a5d5662975aed7f25952f62efbb6f6dadd29 upstream.

p9_read_work and p9_fd_cancelled may be called concurrently.
In some cases, req->req_list may be deleted by both p9_read_work
and p9_fd_cancelled.

We can fix it by ignoring replies associated with a cancelled
request and ignoring cancelled request if message has been received
before lock.

Link: http://lkml.kernel.org/r/20200612090833.36149-1-wanghai38@huawei.com
Fixes: 60ff779c4abb ("9p: client: remove unused code and any reference to "cancelled" function")
Cc: <stable@vger.kernel.org> # v3.12+
Reported-by: syzbot+77a25acfa0382e06ab23@syzkaller.appspotmail.com
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9p: Transport error uninitialized 2019-10-11T16:21:12+00:00 Lu Shuaibing shuaibinglu@126.com 2019-06-13T07:08:54+00:00 07f3596ce34484d99bbd1449381002b09b523528 [ Upstream commit 0ce772fe79b68f83df40f07f28207b292785c677 ] The p9_tag_alloc() does not initialize the transport error t_err field. The struct p9_req_t *req is allocated and stored in a struct p9_client variable. The field t_err is never initialized before p9_conn_cancel() checks its value. KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool) reports this bug. ================================================================== BUG: KUMSAN: use of uninitialized memory in p9_conn_cancel+0x2d9/0x3b0 Read of size 4 at addr ffff88805f9b600c by task kworker/1:2/1216 CPU: 1 PID: 1216 Comm: kworker/1:2 Not tainted 5.2.0-rc4+ #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 Workqueue: events p9_write_work Call Trace: dump_stack+0x75/0xae __kumsan_report+0x17c/0x3e6 kumsan_report+0xe/0x20 p9_conn_cancel+0x2d9/0x3b0 p9_write_work+0x183/0x4a0 process_one_work+0x4d1/0x8c0 worker_thread+0x6e/0x780 kthread+0x1ca/0x1f0 ret_from_fork+0x35/0x40 Allocated by task 1979: save_stack+0x19/0x80 __kumsan_kmalloc.constprop.3+0xbc/0x120 kmem_cache_alloc+0xa7/0x170 p9_client_prepare_req.part.9+0x3b/0x380 p9_client_rpc+0x15e/0x880 p9_client_create+0x3d0/0xac0 v9fs_session_init+0x192/0xc80 v9fs_mount+0x67/0x470 legacy_get_tree+0x70/0xd0 vfs_get_tree+0x4a/0x1c0 do_mount+0xba9/0xf90 ksys_mount+0xa8/0x120 __x64_sys_mount+0x62/0x70 do_syscall_64+0x6d/0x1e0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88805f9b6008 which belongs to the cache p9_req_t of size 144 The buggy address is located 4 bytes inside of 144-byte region [ffff88805f9b6008, ffff88805f9b6098) The buggy address belongs to the page: page:ffffea00017e6d80 refcount:1 mapcount:0 mapping:ffff888068b63740 index:0xffff88805f9b7d90 compound_mapcount: 0 flags: 0x100000000010200(slab|head) raw: 0100000000010200 ffff888068b66450 ffff888068b66450 ffff888068b63740 raw: ffff88805f9b7d90 0000000000100001 00000001ffffffff 0000000000000000 page dumped because: kumsan: bad access detected ================================================================== Link: http://lkml.kernel.org/r/20190613070854.10434-1-shuaibinglu@126.com Signed-off-by: Lu Shuaibing <shuaibinglu@126.com> [dominique.martinet@cea.fr: grouped the added init with the others] Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 0ce772fe79b68f83df40f07f28207b292785c677 ]

The p9_tag_alloc() does not initialize the transport error t_err field.
The struct p9_req_t *req is allocated and stored in a struct p9_client
variable. The field t_err is never initialized before p9_conn_cancel()
checks its value.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports this bug.

==================================================================
BUG: KUMSAN: use of uninitialized memory in p9_conn_cancel+0x2d9/0x3b0
Read of size 4 at addr ffff88805f9b600c by task kworker/1:2/1216

CPU: 1 PID: 1216 Comm: kworker/1:2 Not tainted 5.2.0-rc4+ #28
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Workqueue: events p9_write_work
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 p9_conn_cancel+0x2d9/0x3b0
 p9_write_work+0x183/0x4a0
 process_one_work+0x4d1/0x8c0
 worker_thread+0x6e/0x780
 kthread+0x1ca/0x1f0
 ret_from_fork+0x35/0x40

Allocated by task 1979:
 save_stack+0x19/0x80
 __kumsan_kmalloc.constprop.3+0xbc/0x120
 kmem_cache_alloc+0xa7/0x170
 p9_client_prepare_req.part.9+0x3b/0x380
 p9_client_rpc+0x15e/0x880
 p9_client_create+0x3d0/0xac0
 v9fs_session_init+0x192/0xc80
 v9fs_mount+0x67/0x470
 legacy_get_tree+0x70/0xd0
 vfs_get_tree+0x4a/0x1c0
 do_mount+0xba9/0xf90
 ksys_mount+0xa8/0x120
 __x64_sys_mount+0x62/0x70
 do_syscall_64+0x6d/0x1e0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88805f9b6008
 which belongs to the cache p9_req_t of size 144
The buggy address is located 4 bytes inside of
 144-byte region [ffff88805f9b6008, ffff88805f9b6098)
The buggy address belongs to the page:
page:ffffea00017e6d80 refcount:1 mapcount:0 mapping:ffff888068b63740 index:0xffff88805f9b7d90 compound_mapcount: 0
flags: 0x100000000010200(slab|head)
raw: 0100000000010200 ffff888068b66450 ffff888068b66450 ffff888068b63740
raw: ffff88805f9b7d90 0000000000100001 00000001ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Link: http://lkml.kernel.org/r/20190613070854.10434-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
[dominique.martinet@cea.fr: grouped the added init with the others]
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p/virtio: Add cleanup path in p9_virtio_init 2019-07-26T07:14:25+00:00 YueHaibing yuehaibing@huawei.com 2019-04-30T11:59:42+00:00 b52807e607f19d763ad19c2cdfcb7ef834a15259 commit d4548543fc4ece56c6f04b8586f435fb4fd84c20 upstream. KASAN report this: BUG: unable to handle kernel paging request at ffffffffa0097000 PGD 3870067 P4D 3870067 PUD 3871063 PMD 2326e2067 PTE 0 Oops: 0000 [#1 CPU: 0 PID: 5340 Comm: modprobe Not tainted 5.1.0-rc7+ #25 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014 RIP: 0010:__list_add_valid+0x10/0x70 Code: c3 48 8b 06 55 48 89 e5 5d 48 39 07 0f 94 c0 0f b6 c0 c3 90 90 90 90 90 90 90 55 48 89 d0 48 8b 52 08 48 89 e5 48 39 f2 75 19 <48> 8b 32 48 39 f0 75 3a RSP: 0018:ffffc90000e23c68 EFLAGS: 00010246 RAX: ffffffffa00ad000 RBX: ffffffffa009d000 RCX: 0000000000000000 RDX: ffffffffa0097000 RSI: ffffffffa0097000 RDI: ffffffffa009d000 RBP: ffffc90000e23c68 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa0097000 R13: ffff888231797180 R14: 0000000000000000 R15: ffffc90000e23e78 FS: 00007fb215285540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa0097000 CR3: 000000022f144000 CR4: 00000000000006f0 Call Trace: v9fs_register_trans+0x2f/0x60 [9pnet ? 0xffffffffa0087000 p9_virtio_init+0x25/0x1000 [9pnet_virtio do_one_initcall+0x6c/0x3cc ? kmem_cache_alloc_trace+0x248/0x3b0 do_init_module+0x5b/0x1f1 load_module+0x1db1/0x2690 ? m_show+0x1d0/0x1d0 __do_sys_finit_module+0xc5/0xd0 __x64_sys_finit_module+0x15/0x20 do_syscall_64+0x6b/0x1d0 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb214d8e839 Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 RSP: 002b:00007ffc96554278 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 000055e67eed2aa0 RCX: 00007fb214d8e839 RDX: 0000000000000000 RSI: 000055e67ce95c2e RDI: 0000000000000003 RBP: 000055e67ce95c2e R08: 0000000000000000 R09: 000055e67eed2aa0 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 000055e67eeda500 R14: 0000000000040000 R15: 000055e67eed2aa0 Modules linked in: 9pnet_virtio(+) 9pnet gre rfkill vmw_vsock_virtio_transport_common vsock [last unloaded: 9pnet_virtio CR2: ffffffffa0097000 ---[ end trace 4a52bb13ff07b761 If register_virtio_driver() fails in p9_virtio_init, we should call v9fs_unregister_trans() to do cleanup. Link: http://lkml.kernel.org/r/20190430115942.41840-1-yuehaibing@huawei.com Cc: stable@vger.kernel.org Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: b530cc794024 ("9p: add virtio transport") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit d4548543fc4ece56c6f04b8586f435fb4fd84c20 upstream.

KASAN report this:

BUG: unable to handle kernel paging request at ffffffffa0097000
PGD 3870067 P4D 3870067 PUD 3871063 PMD 2326e2067 PTE 0
Oops: 0000 [#1
CPU: 0 PID: 5340 Comm: modprobe Not tainted 5.1.0-rc7+ #25
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:__list_add_valid+0x10/0x70
Code: c3 48 8b 06 55 48 89 e5 5d 48 39 07 0f 94 c0 0f b6 c0 c3 90 90 90 90 90 90 90 55 48 89 d0 48 8b 52 08 48 89 e5 48 39 f2 75 19 <48> 8b 32 48 39 f0 75 3a

RSP: 0018:ffffc90000e23c68 EFLAGS: 00010246
RAX: ffffffffa00ad000 RBX: ffffffffa009d000 RCX: 0000000000000000
RDX: ffffffffa0097000 RSI: ffffffffa0097000 RDI: ffffffffa009d000
RBP: ffffc90000e23c68 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa0097000
R13: ffff888231797180 R14: 0000000000000000 R15: ffffc90000e23e78
FS:  00007fb215285540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffa0097000 CR3: 000000022f144000 CR4: 00000000000006f0
Call Trace:
 v9fs_register_trans+0x2f/0x60 [9pnet
 ? 0xffffffffa0087000
 p9_virtio_init+0x25/0x1000 [9pnet_virtio
 do_one_initcall+0x6c/0x3cc
 ? kmem_cache_alloc_trace+0x248/0x3b0
 do_init_module+0x5b/0x1f1
 load_module+0x1db1/0x2690
 ? m_show+0x1d0/0x1d0
 __do_sys_finit_module+0xc5/0xd0
 __x64_sys_finit_module+0x15/0x20
 do_syscall_64+0x6b/0x1d0
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fb214d8e839
Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01

RSP: 002b:00007ffc96554278 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000055e67eed2aa0 RCX: 00007fb214d8e839
RDX: 0000000000000000 RSI: 000055e67ce95c2e RDI: 0000000000000003
RBP: 000055e67ce95c2e R08: 0000000000000000 R09: 000055e67eed2aa0
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 000055e67eeda500 R14: 0000000000040000 R15: 000055e67eed2aa0
Modules linked in: 9pnet_virtio(+) 9pnet gre rfkill vmw_vsock_virtio_transport_common vsock [last unloaded: 9pnet_virtio
CR2: ffffffffa0097000
---[ end trace 4a52bb13ff07b761

If register_virtio_driver() fails in p9_virtio_init,
we should call v9fs_unregister_trans() to do cleanup.

Link: http://lkml.kernel.org/r/20190430115942.41840-1-yuehaibing@huawei.com
Cc: stable@vger.kernel.org
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: b530cc794024 ("9p: add virtio transport")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9p/xen: Add cleanup path in p9_trans_xen_init 2019-07-26T07:14:25+00:00 YueHaibing yuehaibing@huawei.com 2019-04-30T14:39:33+00:00 1253882d64d06a851d93acd95c153f3a2cb0c392 commit 80a316ff16276b36d0392a8f8b2f63259857ae98 upstream. If xenbus_register_frontend() fails in p9_trans_xen_init, we should call v9fs_unregister_trans() to do cleanup. Link: http://lkml.kernel.org/r/20190430143933.19368-1-yuehaibing@huawei.com Cc: stable@vger.kernel.org Fixes: 868eb122739a ("xen/9pfs: introduce Xen 9pfs transport driver") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 80a316ff16276b36d0392a8f8b2f63259857ae98 upstream.

If xenbus_register_frontend() fails in p9_trans_xen_init,
we should call v9fs_unregister_trans() to do cleanup.

Link: http://lkml.kernel.org/r/20190430143933.19368-1-yuehaibing@huawei.com
Cc: stable@vger.kernel.org
Fixes: 868eb122739a ("xen/9pfs: introduce Xen 9pfs transport driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/9p: include trans_common.h to fix missing prototype warning. 2019-07-03T11:14:43+00:00 Adeodato Simó dato@net.com.org.es 2018-11-13T06:28:53+00:00 cfbe930c7142dd5bba2068a87f66fd3d3cdb3a69 [ Upstream commit 52ad259eaac0454c1ac7123e7148cf8d6e6f5301 ] This silences -Wmissing-prototypes when defining p9_release_pages. Link: http://lkml.kernel.org/r/b1c4df8f21689b10d451c28fe38e860722d20e71.1542089696.git.dato@net.com.org.es Signed-off-by: Adeodato Simó <dato@net.com.org.es> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 52ad259eaac0454c1ac7123e7148cf8d6e6f5301 ]

This silences -Wmissing-prototypes when defining p9_release_pages.

Link: http://lkml.kernel.org/r/b1c4df8f21689b10d451c28fe38e860722d20e71.1542089696.git.dato@net.com.org.es
Signed-off-by: Adeodato Simó <dato@net.com.org.es>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p/trans_fd: put worker reqs on destroy 2019-07-03T11:14:43+00:00 Dominique Martinet dominique.martinet@cea.fr 2018-10-09T02:38:00+00:00 6518b4126b3fdfbad4d220a5b7f906a38109aa0e [ Upstream commit fb488fc1f2b4c5128540b032892ddec91edaf8d9 ] p9_read_work/p9_write_work might still hold references to a req after having been cancelled; make sure we put any of these to avoid potential request leak on disconnect. Fixes: 728356dedeff8 ("9p: Add refcount to p9_req_t") Link: http://lkml.kernel.org/r/1539057956-23741-2-git-send-email-asmadeus@codewreck.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Reviewed-by: Tomas Bortoli <tomasbortoli@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit fb488fc1f2b4c5128540b032892ddec91edaf8d9 ]

p9_read_work/p9_write_work might still hold references to a req after
having been cancelled; make sure we put any of these to avoid potential
request leak on disconnect.

Fixes: 728356dedeff8 ("9p: Add refcount to p9_req_t")
Link: http://lkml.kernel.org/r/1539057956-23741-2-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Reviewed-by: Tomas Bortoli <tomasbortoli@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p/trans_fd: abort p9_read_work if req status changed 2019-07-03T11:14:43+00:00 Dominique Martinet dominique.martinet@cea.fr 2018-10-09T02:18:52+00:00 6fad469c84fcd3617a27afa61908d1c02a8bacd8 [ Upstream commit e4ca13f7d075e551dc158df6af18fb412a1dba0a ] p9_read_work would try to handle an errored req even if it got put to error state by another thread between the lookup (that worked) and the time it had been fully read. The request itself is safe to use because we hold a ref to it from the lookup (for m->rreq, so it was safe to read into the request data buffer until this point), but the req_list has been deleted at the same time status changed, and client_cb already has been called as well, so we should not do either. Link: http://lkml.kernel.org/r/1539057956-23741-1-git-send-email-asmadeus@codewreck.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Reported-by: syzbot+2222c34dc40b515f30dc@syzkaller.appspotmail.com Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit e4ca13f7d075e551dc158df6af18fb412a1dba0a ]

p9_read_work would try to handle an errored req even if it got put to
error state by another thread between the lookup (that worked) and the
time it had been fully read.
The request itself is safe to use because we hold a ref to it from the
lookup (for m->rreq, so it was safe to read into the request data buffer
until this point), but the req_list has been deleted at the same time
status changed, and client_cb already has been called as well, so we
should not do either.

Link: http://lkml.kernel.org/r/1539057956-23741-1-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reported-by: syzbot+2222c34dc40b515f30dc@syzkaller.appspotmail.com
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p: potential NULL dereference 2019-07-03T11:14:42+00:00 Dan Carpenter dan.carpenter@oracle.com 2018-09-26T10:39:34+00:00 39bf142ae0cac7904e4a60b95bb0bdc1f696387a [ Upstream commit 72ea0321088df2c41eca8cc6160c24bcceb56ac7 ] p9_tag_alloc() is supposed to return error pointers, but we accidentally return a NULL here. It would cause a NULL dereference in the caller. Link: http://lkml.kernel.org/m/20180926103934.GA14535@mwanda Fixes: 996d5b4db4b1 ("9p: Use a slab for allocating requests") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 72ea0321088df2c41eca8cc6160c24bcceb56ac7 ]

p9_tag_alloc() is supposed to return error pointers, but we accidentally
return a NULL here.  It would cause a NULL dereference in the caller.

Link: http://lkml.kernel.org/m/20180926103934.GA14535@mwanda
Fixes: 996d5b4db4b1 ("9p: Use a slab for allocating requests")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9p: p9dirent_read: check network-provided name length 2019-07-03T11:14:42+00:00 Dominique Martinet dominique.martinet@cea.fr 2018-09-07T15:36:08+00:00 6490cdf9d29db37628b73004d11844269a9f31ab [ Upstream commit ef5305f1f72eb1cfcda25c382bb0368509c0385b ] strcpy to dirent->d_name could overflow the buffer, use strscpy to check the provided string length and error out if the size was too big. While we are here, make the function return an error when the pdu parsing failed, instead of returning the pdu offset as if it had been a success... Link: http://lkml.kernel.org/r/1536339057-21974-4-git-send-email-asmadeus@codewreck.org Addresses-Coverity-ID: 139133 ("Copy into fixed size buffer") Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit ef5305f1f72eb1cfcda25c382bb0368509c0385b ]

strcpy to dirent->d_name could overflow the buffer, use strscpy to check
the provided string length and error out if the size was too big.

While we are here, make the function return an error when the pdu
parsing failed, instead of returning the pdu offset as if it had been a
success...

Link: http://lkml.kernel.org/r/1536339057-21974-4-git-send-email-asmadeus@codewreck.org
Addresses-Coverity-ID: 139133 ("Copy into fixed size buffer")
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>