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=-6.8 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,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 93EA0C2D0D2 for ; Thu, 19 Dec 2019 19:00:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5F6FE222C2 for ; Thu, 19 Dec 2019 19:00:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576782018; bh=Y8kBuoMu5pCA7LBmjCTsxVeFNl0rlTalNnm3UUWW1WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ipgrAh/BXzhLqB6s7Ozbkiyuik2Rr49zN1A44DsrewFIA24zz99P2x7jnqQOBkuPt CxAxwji5HyMuhA+hRSslCMU6qD0XHAGeWqrzQAu+lsZXfvtdK3U7fzJ0hHjzzWHF6w scJ+vi6AKG4I2bZ1z7flmkFaO/zLL+MtxJ7h6T3c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730257AbfLSSwV (ORCPT ); Thu, 19 Dec 2019 13:52:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:46886 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730256AbfLSSwU (ORCPT ); Thu, 19 Dec 2019 13:52:20 -0500 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 669F8222C2; Thu, 19 Dec 2019 18:52:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576781539; bh=Y8kBuoMu5pCA7LBmjCTsxVeFNl0rlTalNnm3UUWW1WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zzTudZ4NBdeUV2PzLkBMcSgqgf3LQxkiJF/nzaX1vmT2s/H12ODsJsyogVVxRJOny kyJIiYvtUIxbtqUB2MWpdvRkBDXrxQGsMrjDJWdUmHwZS9CFk5EwXEhJZBsOpF46YE 22vtWN4NfRkI2diZnOZbBAZjBTFFX5QLfyTu9LI0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Srinivas Kandagatla , Arun Kumar Neelakantam , Bjorn Andersson Subject: [PATCH 4.19 26/47] rpmsg: glink: Fix use after free in open_ack TIMEOUT case Date: Thu, 19 Dec 2019 19:34:40 +0100 Message-Id: <20191219182931.586960513@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191219182857.659088743@linuxfoundation.org> References: <20191219182857.659088743@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arun Kumar Neelakantam commit ac74ea01860170699fb3b6ea80c0476774c8e94f upstream. Extra channel reference put when remote sending OPEN_ACK after timeout causes use-after-free while handling next remote CLOSE command. Remove extra reference put in timeout case to avoid use-after-free. Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver") Cc: stable@vger.kernel.org Tested-by: Srinivas Kandagatla Signed-off-by: Arun Kumar Neelakantam Signed-off-by: Bjorn Andersson Signed-off-by: Greg Kroah-Hartman --- drivers/rpmsg/qcom_glink_native.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1106,13 +1106,12 @@ static int qcom_glink_create_remote(stru close_link: /* * Send a close request to "undo" our open-ack. The close-ack will - * release the last reference. + * release qcom_glink_send_open_req() reference and the last reference + * will be relesed after receiving remote_close or transport unregister + * by calling qcom_glink_native_remove(). */ qcom_glink_send_close_req(glink, channel); - /* Release qcom_glink_send_open_req() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - return ret; }