linux-kernel - [PATCH] Fix vq_memory_access

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Message-ID: <20100406201414.GA6528@c-98-229-117-200.hsd1.ma.comcast.net>
Date:	Tue, 6 Apr 2010 16:14:14 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix vq_memory_access_ok error checking

Here's another small patch fixing an error path...

			Jeff

-- 
Work email - jdike at linux dot intel dot com


commit 7938779d9f357ede8bc3c122fd0dc9d5ec4fcf1d
Author: Jeff Dike <jdike@...toit.com>
Date:   Wed Mar 31 15:05:08 2010 -0400

    vq_memory_access_ok needs to check whether mem == NULL

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 7bd7a1e..b8e1127 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -235,6 +235,10 @@ static int vq_memory_access_ok(void __user *log_base, struct vhost_memory *mem,
 			       int log_all)
 {
 	int i;
+
+        if (!mem)
+                return 0;
+
 	for (i = 0; i < mem->nregions; ++i) {
 		struct vhost_memory_region *m = mem->regions + i;
 		unsigned long a = m->userspace_addr;
--
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