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 F171DC7618D for ; Mon, 20 Mar 2023 15:27:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232835AbjCTP1L (ORCPT ); Mon, 20 Mar 2023 11:27:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232844AbjCTP0v (ORCPT ); Mon, 20 Mar 2023 11:26:51 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 983372DE54 for ; Mon, 20 Mar 2023 08:20:07 -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 3CC0BB80D34 for ; Mon, 20 Mar 2023 15:20:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A1880C433EF; Mon, 20 Mar 2023 15:20:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679325606; bh=zxSa/fNaxWCHjv9WMs3urxH7e71umk+dLt7KS9XkCrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0yeknFn/gXqpq+6Q7GtEff70FgaKlRgPI5Yv5TXub8mIoRPbIQ/QQ07EeOqTURbdd UQJPOZ6zM+fL4qnOSpwl5942epo3Qt9mPNDXEZqdUJIO/SkREa7FVVHnXcaAlrk68V /V990/2HrleBer8/vni8RVliVhpFqKy3G4TmVp8I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Liang He , Jens Axboe , Sasha Levin Subject: [PATCH 6.2 069/211] block: sunvdc: add check for mdesc_grab() returning NULL Date: Mon, 20 Mar 2023 15:53:24 +0100 Message-Id: <20230320145516.124330733@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145513.305686421@linuxfoundation.org> References: <20230320145513.305686421@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: Liang He [ Upstream commit 6030363199e3a6341afb467ddddbed56640cbf6a ] In vdc_port_probe(), we should check the return value of mdesc_grab() as it may return NULL, which can cause potential NPD bug. Fixes: 43fdf27470b2 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.") Signed-off-by: Liang He Link: https://lore.kernel.org/r/20230315062032.1741692-1-windhl@126.com [axboe: style cleanup] Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/sunvdc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index fb855da971ee7..9fa821fa76b07 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -972,6 +972,8 @@ static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) print_version(); hp = mdesc_grab(); + if (!hp) + return -ENODEV; err = -ENODEV; if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { -- 2.39.2