netdev - can-bcm: fix minor heap overflow

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Message-ID: <4CDB1856.4040001@hartkopp.net>
Date:	Wed, 10 Nov 2010 23:10:30 +0100
From:	Oliver Hartkopp <socketcan@...tkopp.net>
To:	David Miller <davem@...emloft.net>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Urs Thuermann <urs@...ogud.escape.de>, security@...nel.org
Subject: can-bcm: fix minor heap overflow

On 64-bit platforms the ASCII representation of a pointer may be up to 17
bytes long. This patch increases the length of the buffer accordingly.

http://marc.info/?l=linux-netdev&m=128872251418192&w=2

Reported-by: Dan Rosenberg <drosenberg@...curity.com>
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
CC: Linus Torvalds <torvalds@...ux-foundation.org>

---

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 08ffe9e..6faa825 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -125,7 +125,7 @@ struct bcm_sock {
 	struct list_head tx_ops;
 	unsigned long dropped_usr_msgs;
 	struct proc_dir_entry *bcm_proc_read;
-	char procname [9]; /* pointer printed in ASCII with \0 */
+	char procname [20]; /* pointer printed in ASCII with \0 */
 };

 static inline struct bcm_sock *bcm_sk(const struct sock *sk)

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