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 C739DC6FD1D for ; Mon, 20 Mar 2023 15:05:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231889AbjCTPFt (ORCPT ); Mon, 20 Mar 2023 11:05:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232182AbjCTPEq (ORCPT ); Mon, 20 Mar 2023 11:04:46 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 013D62B9DD for ; Mon, 20 Mar 2023 08:00:46 -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 ams.source.kernel.org (Postfix) with ESMTPS id 98584B80ECD for ; Mon, 20 Mar 2023 15:00:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0361AC4339B; Mon, 20 Mar 2023 15:00:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679324445; bh=tFz0OmXFy/F5X3/97+Pjr0LL8IRvbKfgCWbsIC9jsbo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lyPz9S/mwrAwdlF5+sM9PF8dJIrr3s0z1ncnU9Wp7L6izT76L4DVSpePL4AUyLKH4 2Lqzwr2+RfickwovFLus/5fwcChixaap7ZzUlhe9ZHUwbQXWu92qj8UD17iNYFO80l TizVvSRu6xVIX3hE0UFAsWAK1zPYa6TZsVD9N1ic= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Damien Le Moal , Chaitanya Kulkarni , Christoph Hellwig , Sasha Levin Subject: [PATCH 5.4 26/60] nvmet: avoid potential UAF in nvmet_req_complete() Date: Mon, 20 Mar 2023 15:54:35 +0100 Message-Id: <20230320145432.004209856@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145430.861072439@linuxfoundation.org> References: <20230320145430.861072439@linuxfoundation.org> User-Agent: quilt/0.67 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: Damien Le Moal [ Upstream commit 6173a77b7e9d3e202bdb9897b23f2a8afe7bf286 ] An nvme target ->queue_response() operation implementation may free the request passed as argument. Such implementation potentially could result in a use after free of the request pointer when percpu_ref_put() is called in nvmet_req_complete(). Avoid such problem by using a local variable to save the sq pointer before calling __nvmet_req_complete(), thus avoiding dereferencing the req pointer after that function call. Fixes: a07b4970f464 ("nvmet: add a generic NVMe target") Signed-off-by: Damien Le Moal Reviewed-by: Chaitanya Kulkarni Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- drivers/nvme/target/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index ff206faae775c..d109333b95b81 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -728,8 +728,10 @@ static void __nvmet_req_complete(struct nvmet_req *req, u16 status) void nvmet_req_complete(struct nvmet_req *req, u16 status) { + struct nvmet_sq *sq = req->sq; + __nvmet_req_complete(req, status); - percpu_ref_put(&req->sq->ref); + percpu_ref_put(&sq->ref); } EXPORT_SYMBOL_GPL(nvmet_req_complete); -- 2.39.2