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 E9219C433F5 for ; Mon, 18 Apr 2022 13:57:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244850AbiDROAJ (ORCPT ); Mon, 18 Apr 2022 10:00:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244117AbiDRNi4 (ORCPT ); Mon, 18 Apr 2022 09:38:56 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7032E28998; Mon, 18 Apr 2022 05:58:36 -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 EA7C0612CF; Mon, 18 Apr 2022 12:58:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA47FC385A1; Mon, 18 Apr 2022 12:58:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650286715; bh=AWYy8rOKJFVWVVwDVHX+muVJcjQmAIjXRPSJZ4HgY6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WoZ+OlTGB51hbSDn1b2X+TKwO9xwkdc3pSdV5Oz/kELyonKifxBm2qR/iAvUkQzW5 XosuOgLBOcweqhwJV+/44Dj0B1vgMvsV81NTqZW8/SMxOl+wkb0tVZFge4j0BEWqrE FftV0OzzaIZ+qgmuFpEKN3+Rz7O+c3CTvvYFs/lg= 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 4.14 223/284] scsi: libfc: Fix use after free in fc_exch_abts_resp() Date: Mon, 18 Apr 2022 14:13:24 +0200 Message-Id: <20220418121218.052827139@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121210.689577360@linuxfoundation.org> References: <20220418121210.689577360@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: linux-kernel@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 384458d1f73c..9fa0aa235cb4 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -1709,6 +1709,7 @@ 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