[IPV6] UDP: Possible dst leak in udpv6_sendmsg.

ip6_sk_dst_lookup returns held dst entry. It should be released
on all paths beyond this point. Add missed release when up->pending
is set.

Bug report and initial patch by Denis V. Lunev <den@openvz.org>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Denis V. Lunev <den@openvz.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1fd784f3e2ec..47123bf5eb0f 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -848,12 +848,14 @@ do_append_data:
                 } else {
                         dst_release(dst);
                 }
+                dst = NULL;
         }
 
         if (err > 0)
                 err = np->recverr ? net_xmit_errno(err) : 0;
         release_sock(sk);
 out:
+        dst_release(dst);
         fl6_sock_release(flowlabel);
         if (!err)
                 return len;