tree 15337da48020ddeb9265edcad0abf0255895d881
parent 26ea888f6282b0f5c1977d8ddb2fff1ea0238bd7
author Christoph Probst <kernel@probst.it> 1557242200 +0200
committer Steve French <stfrench@microsoft.com> 1557289495 -0500

cifs: fix strcat buffer overflow and reduce raciness in smb21_set_oplock_level()

Change strcat to strncpy in the "None" case to fix a buffer overflow
when cinode->oplock is reset to 0 by another thread accessing the same
cinode. It is never valid to append "None" to any other message.

Consolidate multiple writes to cinode->oplock to reduce raciness.

Signed-off-by: Christoph Probst <kernel@probst.it>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>