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| author | Bernard Metzler <bmt@zurich.ibm.com> | 2020-03-02 19:16:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-11 18:03:07 +0100 |
| commit | 8457a77611f784abb4b02d01e0e97a1ad3139c8c (patch) | |
| tree | a3991a5ad6d91f39ccbdc62d815a03086d2e009c | |
| parent | 9b2c4c1b2c114c3bbe69351a91213f2aa204a6fc (diff) | |
| download | linux-8457a77611f784abb4b02d01e0e97a1ad3139c8c.tar.gz linux-8457a77611f784abb4b02d01e0e97a1ad3139c8c.tar.bz2 linux-8457a77611f784abb4b02d01e0e97a1ad3139c8c.zip | |
RDMA/iwcm: Fix iwcm work deallocation
commit 810dbc69087b08fd53e1cdd6c709f385bc2921ad upstream.
The dealloc_work_entries() function must update the work_free_list pointer
while freeing its entries, since potentially called again on same list. A
second iteration of the work list caused system crash. This happens, if
work allocation fails during cma_iw_listen() and free_cm_id() tries to
free the list again during cleanup.
Fixes: 922a8e9fb2e0 ("RDMA: iWARP Connection Manager.")
Link: https://lore.kernel.org/r/20200302181614.17042-1-bmt@zurich.ibm.com
Reported-by: syzbot+cb0c054eabfba4342146@syzkaller.appspotmail.com
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/infiniband/core/iwcm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c index 30d7277249b8..16b0c10348e8 100644 --- a/drivers/infiniband/core/iwcm.c +++ b/drivers/infiniband/core/iwcm.c @@ -158,8 +158,10 @@ static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) { struct list_head *e, *tmp; - list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) + list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) { + list_del(e); kfree(list_entry(e, struct iwcm_work, free_list)); + } } static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) |