From: Eric Dumazet Date: Thu, 17 Mar 2016 05:52:15 +0000 (-0700) Subject: tcp/dccp: remove obsolete WARN_ON() in icmp handlers X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e316ea62e3203d524ff0239a40c56d3a39ad1b5c;p=linux-beck.git 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: 079096f103fa ("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 --- diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c index b5672e5fe649..9c67a961ba53 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 0b02ef773705..e7528b101e68 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) {