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| author | Namjae Jeon <linkinjeon@kernel.org> | 2025-03-22 09:20:19 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:33:42 +0200 |
| commit | f0eb3f575138b816da74697bd506682574742fcd (patch) | |
| tree | c621255c7cffce254605c0dd7747be8781fa3d55 | |
| parent | 629dd37acc336ad778979361c351e782053ea284 (diff) | |
| download | linux-f0eb3f575138b816da74697bd506682574742fcd.tar.gz linux-f0eb3f575138b816da74697bd506682574742fcd.tar.bz2 linux-f0eb3f575138b816da74697bd506682574742fcd.zip | |
ksmbd: fix use-after-free in ksmbd_sessions_deregister()
commit 15a9605f8d69dc85005b1a00c31a050b8625e1aa upstream.
In multichannel mode, UAF issue can occur in session_deregister
when the second channel sets up a session through the connection of
the first channel. session that is freed through the global session
table can be accessed again through ->sessions of connection.
Cc: stable@vger.kernel.org
Reported-by: Norbert Szetei <norbert@doyensec.com>
Tested-by: Norbert Szetei <norbert@doyensec.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/smb/server/mgmt/user_session.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/smb/server/mgmt/user_session.c b/fs/smb/server/mgmt/user_session.c index 3bcfe739ba13..c26690586cd8 100644 --- a/fs/smb/server/mgmt/user_session.c +++ b/fs/smb/server/mgmt/user_session.c @@ -229,6 +229,9 @@ void ksmbd_sessions_deregister(struct ksmbd_conn *conn) if (!ksmbd_chann_del(conn, sess) && xa_empty(&sess->ksmbd_chann_list)) { hash_del(&sess->hlist); + down_write(&conn->session_lock); + xa_erase(&conn->sessions, sess->id); + up_write(&conn->session_lock); ksmbd_session_destroy(sess); } } |