Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[~shefty/rdma-dev.git] / net / irda / af_irda.c
index a6de3059746ddd3f3039d564f20acf394225e3ad..c9890e25cd4c9681b14f838976a97ed4db560ac7 100644 (file)
@@ -2280,6 +2280,16 @@ static int irda_getsockopt(struct socket *sock, int level, int optname,
 
        switch (optname) {
        case IRLMP_ENUMDEVICES:
+
+               /* Offset to first device entry */
+               offset = sizeof(struct irda_device_list) -
+                       sizeof(struct irda_device_info);
+
+               if (len < offset) {
+                       err = -EINVAL;
+                       goto out;
+               }
+
                /* Ask lmp for the current discovery log */
                discoveries = irlmp_get_discoveries(&list.len, self->mask.word,
                                                    self->nslots);
@@ -2290,15 +2300,9 @@ static int irda_getsockopt(struct socket *sock, int level, int optname,
                }
 
                /* Write total list length back to client */
-               if (copy_to_user(optval, &list,
-                                sizeof(struct irda_device_list) -
-                                sizeof(struct irda_device_info)))
+               if (copy_to_user(optval, &list, offset))
                        err = -EFAULT;
 
-               /* Offset to first device entry */
-               offset = sizeof(struct irda_device_list) -
-                       sizeof(struct irda_device_info);
-
                /* Copy the list itself - watch for overflow */
                if (list.len > 2048) {
                        err = -EINVAL;