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CIFS: Fix a possible memory corruption in push locks 

commit e3d240e9d5 upstream.

If maxBuf is not 0 but less than a size of SMB2 lock structure
we can end up with a memory corruption.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Pavel Shilovsky 2016-11-29 16:14:43 -08:00 committed by Greg Kroah-Hartman
parent 9f9d98246e
commit c954acc000
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/smb2file.c
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@ -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;
}