udp: with udp_segment release on error path

Failure __ip_append_data triggers udp_flush_pending_frames, but these
tests happen later. The skb must be freed directly.

Fixes: bec1f6f697362 ("udp: generate gso with UDP_SEGMENT")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 3fb0ed5..3d2a81b 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -847,15 +847,23 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
                const int hlen = skb_network_header_len(skb) +
                                 sizeof(struct udphdr);
 
-               if (hlen + cork->gso_size > cork->fragsize)
+               if (hlen + cork->gso_size > cork->fragsize) {
+                       kfree_skb(skb);
                        return -EINVAL;
-               if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS)
+               }
+               if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
+                       kfree_skb(skb);
                        return -EINVAL;
-               if (sk->sk_no_check_tx)
+               }
+               if (sk->sk_no_check_tx) {
+                       kfree_skb(skb);
                        return -EINVAL;
+               }
                if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
-                   dst_xfrm(skb_dst(skb)))
+                   dst_xfrm(skb_dst(skb))) {
+                       kfree_skb(skb);
                        return -EIO;
+               }
 
                skb_shinfo(skb)->gso_size = cork->gso_size;
                skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 7c35050..e1f2b96 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1132,15 +1132,23 @@ static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
                const int hlen = skb_network_header_len(skb) +
                                 sizeof(struct udphdr);
 
-               if (hlen + cork->gso_size > cork->fragsize)
+               if (hlen + cork->gso_size > cork->fragsize) {
+                       kfree_skb(skb);
                        return -EINVAL;
-               if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS)
+               }
+               if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
+                       kfree_skb(skb);
                        return -EINVAL;
-               if (udp_sk(sk)->no_check6_tx)
+               }
+               if (udp_sk(sk)->no_check6_tx) {
+                       kfree_skb(skb);
                        return -EINVAL;
+               }
                if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
-                   dst_xfrm(skb_dst(skb)))
+                   dst_xfrm(skb_dst(skb))) {
+                       kfree_skb(skb);
                        return -EIO;
+               }
 
                skb_shinfo(skb)->gso_size = cork->gso_size;
                skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;