vhost-net: fix vq_memory_access_ok error checking
authorJeff Dike <jdike@addtoit.com>
Wed, 7 Apr 2010 13:59:10 +0000 (09:59 -0400)
committerMichael S. Tsirkin <mst@redhat.com>
Wed, 7 Apr 2010 14:04:45 +0000 (17:04 +0300)
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>
drivers/vhost/vhost.c

index 7bd7a1e4409d4e6f384c513734b743a1b56a55ca..b8e11272081284b58fd042dc88d0b7d0d0ce8e12 100644 (file)
@@ -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;