From patchwork Sat Nov 23 17:42:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuniyuki Iwashima X-Patchwork-Id: 13883896 X-Patchwork-Delegate: kuba@kernel.org Received: from smtp-fw-2101.amazon.com (smtp-fw-2101.amazon.com [72.21.196.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8718A1804A for ; Sat, 23 Nov 2024 17:42:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=72.21.196.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732383772; cv=none; b=segwWvjY9/KZ9xdZ+PmxrNYjavOn2muNIaDtkp/0IH8iJ3e9q44hSYl1sIrZM6meAJnTceY+CHplGsgO36ebfta676I2yg4nCyQOOBDnf1ZS4sgPBLVHCOn9FbGm4dKqqIUMhHyRgOt56tEKDp56mbjrM9t6ZqrznAx2YKI+1iI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732383772; c=relaxed/simple; bh=dmxcL1gAbiMoEmTaiXcyOAfFnuGPWcS9J+WyGaLGWtI=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=uGaLdSwLQhK5I6n2ETF3xbKJi516f946ZJVf+mL7zMihz58Okd14pgyg7hYIX2XnOE6Cnx/m/6ZxAk1htSf62CG893SSWGjk64plyy8mKsgvO1fDvA64bAXvOrpXO9k4lmF7fmvXrtkNML2aYUc+AP6oGvWO9FC0OHwCfd2jDpQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.co.jp; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=pgug6xJ+; arc=none smtp.client-ip=72.21.196.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.co.jp Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="pgug6xJ+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1732383770; x=1763919770; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=0gitUXPTNKu6s1bJVLonH9AFIqRpntLSKUE+HB2o4Jk=; b=pgug6xJ+wnPD8CZzNaMRbaBvVFx87EqgE6jvLU3gKVAQbgvaMUd2ahqx RJwjX03bjwsc/WCpzqHbotYtQN+Ec4gGHKAIJYMOgQd9rc5Dzz7JcnI+a 6ZNVrbxxwF3QoCZbY1ogyYMae5obwnZS3diAxaP9Fv317WUZrl7PxLDSw 0=; X-IronPort-AV: E=Sophos;i="6.12,179,1728950400"; d="scan'208";a="445451387" Received: from iad6-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.124.125.6]) by smtp-border-fw-2101.iad2.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2024 17:42:47 +0000 Received: from EX19MTAUWC002.ant.amazon.com [10.0.7.35:11556] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.38.94:2525] with esmtp (Farcaster) id dedc20ef-3991-48ed-a10f-64fc307be814; Sat, 23 Nov 2024 17:42:45 +0000 (UTC) X-Farcaster-Flow-ID: dedc20ef-3991-48ed-a10f-64fc307be814 Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Sat, 23 Nov 2024 17:42:45 +0000 Received: from 6c7e67c6786f.amazon.com (10.187.171.51) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.35; Sat, 23 Nov 2024 17:42:42 +0000 From: Kuniyuki Iwashima To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni CC: Kuniyuki Iwashima , Kuniyuki Iwashima , , Liu Jian Subject: [PATCH v1 net] tcp: Fix use-after-free of nreq in reqsk_timer_handler(). Date: Sat, 23 Nov 2024 09:42:36 -0800 Message-ID: <20241123174236.62438-1-kuniyu@amazon.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EX19D031UWA001.ant.amazon.com (10.13.139.88) To EX19D004ANA001.ant.amazon.com (10.37.240.138) X-Patchwork-Delegate: kuba@kernel.org The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with __inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler(). Then, oreq should be passed to reqsk_put() instead of req; otherwise use-after-free of nreq could happen when reqsk is migrated but the retry attempt failed (e.g. due to timeout). Let's pass oreq to reqsk_put(). Fixes: e8c526f2bdf1 ("tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().") Reported-by: Liu Jian Closes: https://lore.kernel.org/netdev/1284490f-9525-42ee-b7b8-ccadf6606f6d@huawei.com/ Signed-off-by: Kuniyuki Iwashima --- net/ipv4/inet_connection_sock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 491c2c6b683e..6872b5aff73e 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -1191,7 +1191,7 @@ static void reqsk_timer_handler(struct timer_list *t) drop: __inet_csk_reqsk_queue_drop(sk_listener, oreq, true); - reqsk_put(req); + reqsk_put(oreq); } static bool reqsk_queue_hash_req(struct request_sock *req,