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 4DB85C43217 for ; Fri, 1 Apr 2022 15:02:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343984AbiDAPEb (ORCPT ); Fri, 1 Apr 2022 11:04:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350026AbiDAO6p (ORCPT ); Fri, 1 Apr 2022 10:58:45 -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 35A2817C438; Fri, 1 Apr 2022 07:45:58 -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 C381C60AC0; Fri, 1 Apr 2022 14:45:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68764C34113; Fri, 1 Apr 2022 14:45:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648824357; bh=7+fl+5KI2HLiQc9ZhTDUoUDKUEeoId2FXhuByBCZFuM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K38FbCoMy52gObO/fr4LC1qmAbTvHqbnOUIjZ3BxPIyzXUuPEDgJlpg0EjLXXQqXi ZUDLr95f6WGr/OB7a/UmNklouwLOmVFVM2mV48IUcIcI2uwEpvELPxnmGIVNVkDVug qtmty8bGAFivNmcMUK64MjqRQQxT9NGd62HblfI4SYs+HvfUwdCv3p8DxBJOWjiK2l VuN4EoFIBUZgi+DxVcRhI2nzrwidoBEdTm410fPEnPxRxwvZC1I8OGWK19g4jc52+v xADpXpzl2eibGwHnw/93pC3MijXXp0c2FTXk2+mqHIj6FlqFE5ZT8c5cu28mfK63QS Izhr9ypYRjaNg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jianglei Nie , Hannes Reinecke , "Martin K . Petersen" , Sasha Levin , jejb@linux.ibm.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 31/37] scsi: libfc: Fix use after free in fc_exch_abts_resp() Date: Fri, 1 Apr 2022 10:44:40 -0400 Message-Id: <20220401144446.1954694-31-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401144446.1954694-1-sashal@kernel.org> References: <20220401144446.1954694-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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 e5b18e5d46da..6e2a36eeb12a 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -1697,6 +1697,7 @@ 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); -- 2.34.1