From d4cfec19a9f51edb14845739c2e6177a3d20fe79 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 16 Mar 2016 22:52:15 -0700 Subject: [PATCH] tcp/dccp: remove obsolete WARN_ON() in icmp handlers Now SYN_RECV request sockets are installed in ehash table, an ICMP handler can find a request socket while another cpu handles an incoming packet transforming this SYN_RECV request socket into an ESTABLISHED socket. We need to remove the now obsolete WARN_ON(req->sk), since req->sk is set when a new child is created and added into listener accept queue. If this race happens, the ICMP will do nothing special. Fixes: abe93be0399c ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Eric Dumazet Reported-by: Ben Lazarus Reported-by: Neal Cardwell Signed-off-by: David S. Miller --- net/dccp/ipv4.c | 2 -- net/ipv4/tcp_ipv4.c | 2 -- 2 files changed, 4 deletions(-) diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c index b5672e5fe6496..9c67a961ba538 100644 --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -204,8 +204,6 @@ void dccp_req_err(struct sock *sk, u64 seq) * ICMPs are not backlogged, hence we cannot get an established * socket here. */ - WARN_ON(req->sk); - if (!between48(seq, dccp_rsk(req)->dreq_iss, dccp_rsk(req)->dreq_gss)) { NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); } else { diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 0b02ef7737057..e7528b101e680 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -319,8 +319,6 @@ void tcp_req_err(struct sock *sk, u32 seq, bool abort) /* ICMPs are not backlogged, hence we cannot get * an established socket here. */ - WARN_ON(req->sk); - if (seq != tcp_rsk(req)->snt_isn) { NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); } else if (abort) { -- 2.39.5