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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB871C5518A for ; Wed, 22 Apr 2020 10:47:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A64B2076E for ; Wed, 22 Apr 2020 10:47:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587552479; bh=J2Tscg0fW3pcCyob+6YGj5QCeCv1qdJ+BxsxnfTJYBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=onIOxy8mOF9uGMMmzvxNG9PPpyCyAYv21KterF7hL/116ZcCfGI/xlbiJznIt2tgI kcvRsK+NVNJE761uNNL3tfHia5EnYvjEuxN8zjevdMmb8APcFfOy2PbIV4NP1pmtVy AtBSdlV/ZX1/qfJbM5BigP5n8Ro04BwLviXrjWWg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732027AbgDVKrw (ORCPT ); Wed, 22 Apr 2020 06:47:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:50464 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729244AbgDVKPP (ORCPT ); Wed, 22 Apr 2020 06:15:15 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CC2E620575; Wed, 22 Apr 2020 10:15:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550514; bh=J2Tscg0fW3pcCyob+6YGj5QCeCv1qdJ+BxsxnfTJYBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TLswHyqUxGOOeL7690T5HGokE8YX2bguNeD/qulb4+Fa3JXDm0Wd562vuNHuYPQCR z6QmaszBoERT/Ab4e3n7opudlj78JEeQ8Ze+FCBs9VsqBH4T+LFT+rrsHZctRsx31D jVAdgPTn0InLg8jawocDI1oDglxUNLz1dRZA0+Wk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chao Yu , Jaegeuk Kim , Sasha Levin Subject: [PATCH 4.19 46/64] f2fs: fix NULL pointer dereference in f2fs_write_begin() Date: Wed, 22 Apr 2020 11:57:30 +0200 Message-Id: <20200422095021.001448305@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095008.799686511@linuxfoundation.org> References: <20200422095008.799686511@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chao Yu [ Upstream commit 62f63eea291b50a5677ae7503ac128803174698a ] BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:f2fs_write_begin+0x823/0xb90 [f2fs] Call Trace: f2fs_quota_write+0x139/0x1d0 [f2fs] write_blk+0x36/0x80 [quota_tree] get_free_dqblk+0x42/0xa0 [quota_tree] do_insert_tree+0x235/0x4a0 [quota_tree] do_insert_tree+0x26e/0x4a0 [quota_tree] do_insert_tree+0x26e/0x4a0 [quota_tree] do_insert_tree+0x26e/0x4a0 [quota_tree] qtree_write_dquot+0x70/0x190 [quota_tree] v2_write_dquot+0x43/0x90 [quota_v2] dquot_acquire+0x77/0x100 f2fs_dquot_acquire+0x2f/0x60 [f2fs] dqget+0x310/0x450 dquot_transfer+0x7e/0x120 f2fs_setattr+0x11a/0x4a0 [f2fs] notify_change+0x349/0x480 chown_common+0x168/0x1c0 do_fchownat+0xbc/0xf0 __x64_sys_fchownat+0x20/0x30 do_syscall_64+0x5f/0x220 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Passing fsdata parameter to .write_{begin,end} in f2fs_quota_write(), so that if quota file is compressed one, we can avoid above NULL pointer dereference when updating quota content. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index da348cf4ff56a..45f8f6ec22a55 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1648,6 +1648,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type, int offset = off & (sb->s_blocksize - 1); size_t towrite = len; struct page *page; + void *fsdata = NULL; char *kaddr; int err = 0; int tocopy; @@ -1657,7 +1658,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type, towrite); retry: err = a_ops->write_begin(NULL, mapping, off, tocopy, 0, - &page, NULL); + &page, &fsdata); if (unlikely(err)) { if (err == -ENOMEM) { congestion_wait(BLK_RW_ASYNC, HZ/50); @@ -1672,7 +1673,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type, flush_dcache_page(page); a_ops->write_end(NULL, mapping, off, tocopy, tocopy, - page, NULL); + page, fsdata); offset = 0; towrite -= tocopy; off += tocopy; -- 2.20.1