From: Eric Dumazet <eduma...@google.com>
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 <eduma...@google.com>
Reported-by: Ben Lazarus <blaza...@google.com>
Reported-by: Neal Cardwell <ncardw...@google.com>
---
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 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) {
