[PATCH] Fix vq_memory_access_ok error checking

[Jeff Dike]

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@xxxxxxxxxxx>
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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