netrom: copy_datagram_iovec can fail

[ Upstream commit 6cf5c951175abcec4da470c50565cc0afe6cd11d ]

Check for an error from this and if so bail properly.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 732152f..f156382 100644 (file)
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1170,7 +1170,12 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
                msg->msg_flags |= MSG_TRUNC;
        }
 
-       skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+       er = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+       if (er < 0) {
+               skb_free_datagram(sk, skb);
+               release_sock(sk);
+               return er;
+       }
 
        if (sax != NULL) {
                sax->sax25_family = AF_NETROM;