From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAFBBC2D0F9 for ; Wed, 13 May 2020 09:54:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3507205ED for ; Wed, 13 May 2020 09:54:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589363656; bh=wVQB35DVJkUTTN5UUzYKgILYjZl1UWPiepEnvyRw1Ps=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=w7VaU/vjOYC39i8GzodUO3HIr/62MmNkzHWPiCQdqZntvVQluha0wT8nMDvx3m6Nr 2j4Hwp1vcoavUpuMqKUce/iMYCQbQPDjTUk+fKb97Tlu6vex5XJD8ZCRsrnnW6YPpI D4xTETVBqACt63l3/iBRkbGHAgDQnDa6EJi8SY48= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387591AbgEMJyP (ORCPT ); Wed, 13 May 2020 05:54:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:56450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388053AbgEMJyJ (ORCPT ); Wed, 13 May 2020 05:54:09 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6B42B20575; Wed, 13 May 2020 09:54:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589363648; bh=wVQB35DVJkUTTN5UUzYKgILYjZl1UWPiepEnvyRw1Ps=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n3j71y3tMs0N/iL0fhkmJLShe1oD06ghvDNSvo91HiAx0LBHXwPZ4h5ijgV6l6UvJ O17n4wHRTDlRA3dnyH946T/UvjB27ks4kyfJY+8h3p46V40N3DUyl6HSQZ6RWP3wtV aaDBH2EJ28lMj5QWn+ALPZYJZHsxSBQ85RfP217Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiyu Yang , Xin Tan , "David S. Miller" Subject: [PATCH 5.6 032/118] net/tls: Fix sk_psock refcnt leak when in tls_data_ready() Date: Wed, 13 May 2020 11:44:11 +0200 Message-Id: <20200513094420.336676639@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200513094417.618129545@linuxfoundation.org> References: <20200513094417.618129545@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiyu Yang [ Upstream commit 62b4011fa7bef9fa00a6aeec26e69685dc1cc21e ] tls_data_ready() invokes sk_psock_get(), which returns a reference of the specified sk_psock object to "psock" with increased refcnt. When tls_data_ready() returns, local variable "psock" becomes invalid, so the refcount should be decreased to keep refcount balanced. The reference counting issue happens in one exception handling path of tls_data_ready(). When "psock->ingress_msg" is empty but "psock" is not NULL, the function forgets to decrease the refcnt increased by sk_psock_get(), causing a refcnt leak. Fix this issue by calling sk_psock_put() on all paths when "psock" is not NULL. Signed-off-by: Xiyu Yang Signed-off-by: Xin Tan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/tls/tls_sw.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -2083,8 +2083,9 @@ static void tls_data_ready(struct sock * strp_data_ready(&ctx->strp); psock = sk_psock_get(sk); - if (psock && !list_empty(&psock->ingress_msg)) { - ctx->saved_data_ready(sk); + if (psock) { + if (!list_empty(&psock->ingress_msg)) + ctx->saved_data_ready(sk); sk_psock_put(sk, psock); } }