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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: 079096f103 ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Ben Lazarus <blazarus@google.com>
Reported-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-03-16 22:52:15 -07:00 committed by David S. Miller
parent f6773c5e95
commit e316ea62e3
2 changed files with 0 additions and 4 deletions
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2
net/dccp/ipv4.c
View File

@ -204,8 +204,6 @@ void dccp_req_err(struct sock *sk, u64 seq)
* ICMPs are not backlogged, hence we cannot get an established * ICMPs are not backlogged, hence we cannot get an established
* socket here. * socket here.
*/ */
WARN_ON(req->sk);
if (!between48(seq, dccp_rsk(req)->dreq_iss, dccp_rsk(req)->dreq_gss)) { if (!between48(seq, dccp_rsk(req)->dreq_iss, dccp_rsk(req)->dreq_gss)) {
NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
} else { } else {

2
net/ipv4/tcp_ipv4.c
View File

@ -319,8 +319,6 @@ void tcp_req_err(struct sock *sk, u32 seq, bool abort)
/* ICMPs are not backlogged, hence we cannot get /* ICMPs are not backlogged, hence we cannot get
* an established socket here. * an established socket here.
*/ */
WARN_ON(req->sk);
if (seq != tcp_rsk(req)->snt_isn) { if (seq != tcp_rsk(req)->snt_isn) {
NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
} else if (abort) { } else if (abort) {