vhost-net: fix vq_memory_access_ok error checking

vq_memory_access_ok needs to check whether mem == NULL Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
mariux64 · Apr 7, 2010 · 179b284 · 179b284
1 parent 535297a
commit 179b284
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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;