From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793830999; b=U1U36xCCKoe2CIcotzHRDUtMRleM6xXgwwtedFPQ1CLgARm9hqkD85kjZGXwkdkUitgf D7NHSNeQFTnXV42J5E12iVM9wQN0TlWghCVITJO9wmcTcZiQlXiKtmT5mCPkupW/hhOFy MTaslfBTxPnL6SMoKAj4PupECQ7KyGdlTpJOsu5w0lt617gIx70UY5xrDdhWDPkdiSTp/ LfyAUFfYSCHEwVQ9+wCAHNJBOwNCoQ6OrwgGIqT/eaeF5oT0uoapauDNuaGlulaTMk13R rtI3LG06u4TN5BER+6f17cjL1B8oLmrokqYRpCaonNA2iVz9u3+6S88P2n08z3YcG8w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793830999; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=qUnXA6y8uDMEdw5XWTwUykB5W8VAcW1siMJXZigFdiY=; b=aYTKXYc9kkjK1PT8h6uypkmLqI3V+aMr0n623GGFxnLCUv+Jt6SFAGifUY4Kggf3c/6L FTUj0o2UPwSUmdfBnSmsSEewQOLqYWc1K1wSAi4RnvP1lTynC2P0lqnvc7sNhy2PEzljF 1lOhbCXTb+xV+ICcc2tArTKCIPh333LUAiQyVPAf86Ltn5xswgJl1c8G3CZ3B99yPgC/x d7cl87fstxHiWrUMmyl+q4CJDmeaXxNbCE0T44gWCrUe0TcmJ1xkGWZNftJ0Zfn1GqWLI zEOPgLQ/60ozTAHmNQvXqZ4BzkMjh+1s0rxkG6cGYd/JOmrgwvOClX8YliVnFV1OAdw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ru9oD+pY; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 64BFA606AB06; Wed, 4 Nov 2026 22:23:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ru9oD+pY Received: by smtp.kernel.org (Postfix) with ESMTPSA id F368C1F000C1; Wed, 4 Nov 2026 22:23:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793830999; bh=qUnXA6y8uDMEdw5XWTwUykB5W8VAcW1siMJXZigFdiY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ru9oD+pYL2sLTOw2gygHdRrMDS1Im748yzK+xDy8uMptBu5wlHKumH9ZRLc4zChoK 2jWsvBdp+S5cz5C+//GYhEFIir+AccJPIixljDHz1CXIGZsfTbdq3RpcXvNKqZqNiV BKWSJN0yexJ77lmLR+dzKzNKXQZTEKzjEgyez83Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Namjae Jeon , Sasha Levin Subject: [PATCH 6.18 0448/1005] ksmbd: enable TCP keepalive for accepted connections Date: Wed, 4 Nov 2026 16:03:01 -0500 Message-ID: <20261104211056.605440038@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Namjae Jeon [ Upstream commit 56549c18a4f75309161ca780feaa4d17904e3ee9 ] A client that disappears without sending a FIN or RST can leave its ksmbd connection in ESTABLISHED indefinitely. ksmbd sets a socket receive timeout, but the connection receive loop retries timeout errors without a limit, so the connection remains in conn_list and consumes the per-IP connection quota. Enable SO_KEEPALIVE on accepted TCP sockets so the TCP stack can detect a silent peer failure. The keepalive idle time, interval, and probe count remain controlled by the existing TCP sysctl settings. Signed-off-by: Namjae Jeon Signed-off-by: Sasha Levin --- fs/smb/server/transport_tcp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/smb/server/transport_tcp.c b/fs/smb/server/transport_tcp.c index 472d387098767..ede54bb049532 100644 --- a/fs/smb/server/transport_tcp.c +++ b/fs/smb/server/transport_tcp.c @@ -312,6 +312,12 @@ static int ksmbd_kthread_fn(void *p) ksmbd_debug(CONN, "connect success: accepted new connection\n"); client_sk->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT; client_sk->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT; + /* + * Detect peers that disappear without sending a FIN or RST. + * Otherwise the connection handler can retry receive timeouts + * indefinitely and keep the connection in conn_list. + */ + sock_set_keepalive(client_sk->sk); ksmbd_tcp_new_connection(client_sk); } -- 2.53.0