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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E52EC4332F for ; Mon, 18 Apr 2022 14:11:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245552AbiDROOJ (ORCPT ); Mon, 18 Apr 2022 10:14:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245577AbiDROMB (ORCPT ); Mon, 18 Apr 2022 10:12:01 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA83B37AAD; Mon, 18 Apr 2022 06:11:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4EA1060EFC; Mon, 18 Apr 2022 13:11:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F609C385A1; Mon, 18 Apr 2022 13:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650287484; bh=WBNDiG05gPwN3KYzMZB4phUJsfyThFDNRPvbhfd8Qa8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yDPpynslCp6sVm+8uQ3P9VnK4bm/5W3XZO9C2DsRH+Zq14nHY/U8dLzOfrbmFkm+p Gs4qWapPpattgPUBYGagihOVIaz9x1s3hoJQzD7GzlYVjHF0oEC1twMWXANiQo+chZ XiXnphYgQskxxgueF+svIt7VRu0BjLwopLzF2oz8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hannes Reinecke , Jianglei Nie , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.9 177/218] scsi: libfc: Fix use after free in fc_exch_abts_resp() Date: Mon, 18 Apr 2022 14:14:03 +0200 Message-Id: <20220418121205.815454939@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121158.636999985@linuxfoundation.org> References: <20220418121158.636999985@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jianglei Nie [ Upstream commit 271add11994ba1a334859069367e04d2be2ebdd4 ] fc_exch_release(ep) will decrease the ep's reference count. When the reference count reaches zero, it is freed. But ep is still used in the following code, which will lead to a use after free. Return after the fc_exch_release() call to avoid use after free. Link: https://lore.kernel.org/r/20220303015115.459778-1-niejianglei2021@163.com Reviewed-by: Hannes Reinecke Signed-off-by: Jianglei Nie Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/libfc/fc_exch.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c index 59fd6101f188..177e494b5e47 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -1663,6 +1663,7 @@ static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) if (cancel_delayed_work_sync(&ep->timeout_work)) { FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); fc_exch_release(ep); /* release from pending timer hold */ + return; } spin_lock_bh(&ep->ex_lock); -- 2.35.1