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authorPavel Shilovsky <pshilov@microsoft.com>2016-11-29 16:14:43 -0800
committerPavel Shilovsky <pshilov@microsoft.com>2016-12-05 11:08:55 -0800
commite3d240e9d505fc67f8f8735836df97a794bbd946 (patch)
tree3c40fb55ccc300c2f34cdcbbdfc1a715d069df38 /fs
parent4772c79599564bd08ee6682715a7d3516f67433f (diff)
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CIFS: Fix a possible memory corruption in push locks
If maxBuf is not 0 but less than a size of SMB2 lock structure we can end up with a memory corruption. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/smb2file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
index f9e766f464be..b2aff0c6f22c 100644
--- a/fs/cifs/smb2file.c
+++ b/fs/cifs/smb2file.c
@@ -260,7 +260,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
* and check it for zero before using.
*/
max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
- if (!max_buf) {
+ if (max_buf < sizeof(struct smb2_lock_element)) {
free_xid(xid);
return -EINVAL;
}