linux-kernel - Re: Linus 2.6.23-rc1, xen fix

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Message-ID: <20070723155248.GA6889@elte.hu>
Date:	Mon, 23 Jul 2007 17:52:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: Linus 2.6.23-rc1, xen fix

Subject: xen: fix process_msg() use-after-kfree
From: Ingo Molnar <mingo@...e.hu>

fix an obvious use-after-kfree bug in Xen.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 drivers/xen/xenbus/xenbus_xs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/xen/xenbus/xenbus_xs.c
===================================================================
--- linux.orig/drivers/xen/xenbus/xenbus_xs.c
+++ linux/drivers/xen/xenbus/xenbus_xs.c
@@ -782,8 +782,8 @@ static int process_msg(void)
 		msg->u.watch.vec = split(body, msg->hdr.len,
 					 &msg->u.watch.vec_size);
 		if (IS_ERR(msg->u.watch.vec)) {
-			kfree(msg);
 			err = PTR_ERR(msg->u.watch.vec);
+			kfree(msg);
 			goto out;
 		}
 
-
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