| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.8 73/85] CIFS: Fix a possible memory corruption in push locks | Date | Wed, 4 Jan 2017 21:47:58 +0100 |
| |
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pavel Shilovsky <pshilov@microsoft.com>
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>
--- fs/cifs/smb2file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -260,7 +260,7 @@ smb2_push_mandatory_locks(struct cifsFil * 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; }
|