From: Eric Dumazet <eduma...@google.com>
As we no longer hold listener lock in fast path, it is possible that a
child is created right after listener freed its bound port, if a close()
is done while incoming packets are processed.
__inet_inherit_port() must detect this and return an error,
so that caller can free the child earlier.
Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
net/ipv4/inet_hashtables.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 08643a3616af..958728a22001 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -137,6 +137,10 @@ int __inet_inherit_port(const struct sock *sk, struct sock
*child)
spin_lock(&head->lock);
tb = inet_csk(sk)->icsk_bind_hash;
+ if (unlikely(!tb)) {
+ spin_unlock(&head->lock);
+ return -ENOENT;
+ }
if (tb->port != port) {
/* NOTE: using tproxy and redirecting skbs to a proxy
* on a different listener port breaks the assumption
--
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