[PATCH v1 net 2/2] net: Call net_enable_timestamp() before failure in sk_clone().

[Kuniyuki Iwashima <kuniyu@google.com>]

When sk_clone() fails, sk_destruct() is called for the new socket.

If the parent socket has SK_FLAGS_TIMESTAMP in sk->sk_flags,
net_disable_timestamp() is called for the child socket even though
net_enable_timestamp() is not called for it.

Let's call net_enable_timestamp() before any failure path in
sk_clone().

Fixes: 704da560c0a0 ("tcp: update the netstamp_needed counter when cloning sockets")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260709032007.9E4D61F000E9@smtp.kernel.org/
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 net/core/sock.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index fc3ff0552d68..504d82a3aacd 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2546,6 +2546,9 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority,
 
 	RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
 
+	if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
+		net_enable_timestamp();
+
 	rcu_read_lock();
 	filter = rcu_dereference(sk->sk_filter);
 	if (filter != NULL)
@@ -2595,9 +2598,6 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority,
 
 	if (newsk->sk_prot->sockets_allocated)
 		sk_sockets_allocated_inc(newsk);
-
-	if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
-		net_enable_timestamp();
 out:
 	return newsk;
 free:
-- 
2.55.0.795.g602f6c329a-goog