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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5FF6CC4332F for ; Tue, 29 Nov 2022 03:35:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=FjjZnJ4E6LcgU0PjOc+JDV0QLUnnBS8kq+oyYDSvpLk=; b=jFzY0MvuuJ1LdK qbMM7pdTOmI4xvTkkqDxJaR40zFvlIdwfH9CwFwdTkv/zgw6RcuYrQ7MQ61niq6RbESlBHBivY9m6 iWgeqovo+u4/9AQ/A3ig0+xyG6d+f5PLOevr9tWK7OZOaNYCPwycsODXywuSA5gI9CJGKl46+hCWM BTgz+6I5ZsEFWZm+RV8nvQob2pRoGm+Ic5k/uK59rmhVLLbFEcciqHFYk0WpbCKi83dzLchqD9UFB PJZ9CTF44+NvdVz7sas2aD2fmiswsLGT5iCqn4Lv3EagwDFOfMxEhg0lcrT7wE2BeGWgunLPEKbdd +GhIayYmz88T1L/6ZfXw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ozrNm-005kgD-NK; Tue, 29 Nov 2022 03:34:06 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ozrNh-005kca-Nd; Tue, 29 Nov 2022 03:34:03 +0000 X-UUID: f8a7d1c3e6a9426da8efd7ad5bbdea2d-20221128 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=chkAIHmegmyVzd+tdd1i+sV1+2hUP1r7GSczTaWti94=; b=MeoLvWj/DvkZ5dSHmvgXPEXGzl9yC8wFh3RpG2UjSLw8jjNZIHuaTB3XxQ/rkADADAuMlv5f9hkAY0I9YG6D9AkWHs19RsT6PxTElJI04DCqpotsqI89YoKWrihlauP0AcTXJ4Sp6cL/bzMjosrnNcYJFAfCrj3P/3vNz65SEuw=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.14,REQID:da4324ff-91b3-4bcf-a058-c63246f21c46,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:95 X-CID-INFO: VERSION:1.1.14,REQID:da4324ff-91b3-4bcf-a058-c63246f21c46,IP:0,URL :0,TC:0,Content:0,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Spam_GS981B3D,ACTION :quarantine,TS:95 X-CID-META: VersionHash:dcaaed0,CLOUDID:ac531730-2938-482e-aafd-98d66723b8a9,B ulkID:221129113323BOCVU8WU,BulkQuantity:1,Recheck:0,SF:38|28|17|19|48,TC:n il,Content:0,EDM:-3,IP:nil,URL:0,File:nil,Bulk:40,QS:nil,BEC:nil,COL:0 X-UUID: f8a7d1c3e6a9426da8efd7ad5bbdea2d-20221128 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1289506605; Mon, 28 Nov 2022 20:33:54 -0700 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Tue, 29 Nov 2022 11:33:21 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Tue, 29 Nov 2022 11:33:21 +0800 From: Andrew Yang To: Steven Rostedt , Masami Hiramatsu , Matthias Brugger CC: Casper Li , andrew.yang , , , Subject: [PATCH] mm/writeback: fix dereferencing NULL mapping->host Date: Tue, 29 Nov 2022 11:32:59 +0800 Message-ID: <20221129033304.4465-1-andrew.yang@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221128_193401_839486_C732802C X-CRM114-Status: GOOD ( 10.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "andrew.yang" Check before dereferencing mapping->host Signed-off-by: andrew.yang --- include/trace/events/writeback.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index 86b2a82da546..56f6e114d3ed 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -68,7 +68,7 @@ DECLARE_EVENT_CLASS(writeback_folio_template, strscpy_pad(__entry->name, bdi_dev_name(mapping ? inode_to_bdi(mapping->host) : NULL), 32); - __entry->ino = mapping ? mapping->host->i_ino : 0; + __entry->ino = mapping && mapping->host ? mapping->host->i_ino : 0; __entry->index = folio->index; ), -- 2.18.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel