From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
commit fdaf88531cfd17b2a710cceb3141ef6f9085ff40 upstream.
When we backport dadd0dcaa67d ("net/ulp: prevent ULP without clone op from
entering the LISTEN status"), we have accidentally backported a part of
7a7160edf1bf ("net: Return errno in sk->sk_prot->get_port().") and removed
err = -EADDRINUSE in inet_csk_listen_start().
Thus, listen() no longer returns -EADDRINUSE even if ->get_port() failed
as reported in [0].
We set -EADDRINUSE to err just before ->get_port() to fix the regression.
[0]: https://lore.kernel.org/stable/EF8A45D0-768A-4CD5-9A8A-0FA6E610ABF7@xxxxxxxxxxx/
Reported-by: Winter <winter@xxxxxxxxxxx>
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/inet_connection_sock.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -946,6 +946,7 @@ int inet_csk_listen_start(struct sock *s
* It is OK, because this socket enters to hash table only
* after validation is complete.
*/
+ err = -EADDRINUSE;
inet_sk_state_store(sk, TCP_LISTEN);
if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
inet->inet_sport = htons(inet->inet_num);
