linux-kernel - [patch 32/55] cifs: Fix oops in session setup code for null user mounts

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Message-Id: <20120210223443.108958973@clark.kroah.org>
Date:	Fri, 10 Feb 2012 14:33:36 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jeff Layton <jlayton@...hat.com>,
	Shirish Pargaonkar <shirishpargaonkar@...il.com>,
	Steve French <smfrench@...il.com>
Subject: [patch 32/55] cifs: Fix oops in session setup code for null user mounts

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

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

From: Shirish Pargaonkar <shirishpargaonkar@...il.com>

commit de47a4176c532ef5961b8a46a2d541a3517412d3 upstream.

For null user mounts, do not invoke string length function
during session setup.

Reported-and-Tested-by: Chris Clayton <chris2553@...glemail.com>
Acked-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@...il.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/sess.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -244,16 +244,15 @@ static void ascii_ssetup_strings(char **
 	/* copy user */
 	/* BB what about null user mounts - check that we do this BB */
 	/* copy user */
-	if (ses->user_name != NULL)
+	if (ses->user_name != NULL) {
 		strncpy(bcc_ptr, ses->user_name, MAX_USERNAME_SIZE);
+		bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE);
+	}
 	/* else null user mount */
-
-	bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE);
 	*bcc_ptr = 0;
 	bcc_ptr++; /* account for null termination */
 
 	/* copy domain */
-
 	if (ses->domainName != NULL) {
 		strncpy(bcc_ptr, ses->domainName, 256);
 		bcc_ptr += strnlen(ses->domainName, 256);


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