@@ -665,10 +665,18 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
if (ro->count > 0) {
int fsize = ro->count * sizeof(struct can_filter);
- if (len > fsize)
- len = fsize;
- if (copy_to_user(optval, ro->filter, len))
- err = -EFAULT;
+ /* user space buffer to small for filter list? */
+ if (len < fsize) {
+ /* return -ERANGE and needed space in optlen */
+ err = -ERANGE;
+ if (put_user(fsize, optlen))
+ err = -EFAULT;
+ } else {
+ if (len > fsize)
+ len = fsize;
+ if (copy_to_user(optval, ro->filter, len))
+ err = -EFAULT;
+ }
} else {
len = 0;
}