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CIFS: Fix a possible memory corruption in push locks

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commit e3d240e9d505fc67f8f8735836df97a794bbd946 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>
This commit is contained in:
Pavel Shilovsky 2016-11-29 16:14:43 -08:00 • committed by Greg Kroah-Hartman
parent a9c69e1528
commit 597f9c03b2
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. * and check it for zero before using.
*/ */
max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
if (!max_buf) { if (max_buf < sizeof(struct smb2_lock_element)) {
free_xid(xid); free_xid(xid);
return -EINVAL; return -EINVAL;
} }