[IPV4]: Fix DST leak in icmp_push_reply()

Based upon a bug report and initial patch by
Ollie Wild.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 3d78464f64ea5f0d98c40a2d1ed979943e6cea0e..badfc584997336ff5dc94a49c13420796de68060 100644 (file)
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -349,12 +349,12 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
 {
        struct sk_buff *skb;
 
-       ip_append_data(icmp_socket->sk, icmp_glue_bits, icmp_param,
-                      icmp_param->data_len+icmp_param->head_len,
-                      icmp_param->head_len,
-                      ipc, rt, MSG_DONTWAIT);
-
-       if ((skb = skb_peek(&icmp_socket->sk->sk_write_queue)) != NULL) {
+       if (ip_append_data(icmp_socket->sk, icmp_glue_bits, icmp_param,
+                          icmp_param->data_len+icmp_param->head_len,
+                          icmp_param->head_len,
+                          ipc, rt, MSG_DONTWAIT) < 0)
+               ip_flush_pending_frames(icmp_socket->sk);
+       else if ((skb = skb_peek(&icmp_socket->sk->sk_write_queue)) != NULL) {
                struct icmphdr *icmph = skb->h.icmph;
                unsigned int csum = 0;
                struct sk_buff *skb1;