linux-kernel - [PATCH 3.12 040/235] CIFS: Fix a possible memory corruption in push locks

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Date:   Fri, 27 Jan 2017 11:52:53 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 040/235] CIFS: Fix a possible memory corruption in push locks

From: Pavel Shilovsky <pshilov@...rosoft.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@...rosoft.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/cifs/smb2file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
index 45992944e238..b87b07504947 100644
--- a/fs/cifs/smb2file.c
+++ b/fs/cifs/smb2file.c
@@ -241,7 +241,7 @@ 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;
 	}
-- 
2.11.0