From 1e0c14f49d6b393179f423abbac47f85618d3d46 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Tue, 3 Oct 2006 14:35:49 -0700 Subject: [PATCH] [UDP]: Fix MSG_PROBE crash UDP tracks corking status through the pending variable. The IP layer also tracks it through the socket write queue. It is possible for the two to get out of sync when MSG_PROBE is used. This patch changes UDP to check the write queue to ensure that the two stay in sync. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/udp.c | 2 ++ net/ipv6/udp.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 6d6142f9c4..865d75214a 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -675,6 +675,8 @@ do_append_data: udp_flush_pending_frames(sk); else if (!corkreq) err = udp_push_pending_frames(sk, up); + else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) + up->pending = 0; release_sock(sk); out: diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 552ec0f449..e0c3934a7e 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -770,6 +770,8 @@ do_append_data: udp_v6_flush_pending_frames(sk); else if (!corkreq) err = udp_v6_push_pending_frames(sk, up); + else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) + up->pending = 0; if (dst) { if (connected) { -- 2.39.5