linux-kernel - [PATCH 3.13 017/103] [CIFS] Possible null ptr deref in SMB2

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Message-Id: <1412112708-27356-18-git-send-email-kamal@canonical.com>
Date:	Tue, 30 Sep 2014 14:30:22 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Steve French <smfrench@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 017/103] [CIFS] Possible null ptr deref in SMB2_tcon

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

------------------

From: Steve French <smfrench@...il.com>

commit 18f39e7be0121317550d03e267e3ebd4dbfbb3ce upstream.

As Raphael Geissert pointed out, tcon_error_exit can dereference tcon
and there is one path in which tcon can be null.

Signed-off-by: Steve French <smfrench@...il.com>
Reported-by: Raphael Geissert <geissert@...ian.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/cifs/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 63339c5..ec2c0ac 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -916,7 +916,8 @@ tcon_exit:
 tcon_error_exit:
 	if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
-		tcon->bad_network_name = true;
+		if (tcon)
+			tcon->bad_network_name = true;
 	}
 	goto tcon_exit;
 }
-- 
1.9.1

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