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 DDF1EC77B6E for ; Mon, 10 Apr 2023 02:14:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229679AbjDJCON (ORCPT ); Sun, 9 Apr 2023 22:14:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229485AbjDJCOM (ORCPT ); Sun, 9 Apr 2023 22:14:12 -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 B71D92701 for ; Sun, 9 Apr 2023 19:14:11 -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 549B260D32 for ; Mon, 10 Apr 2023 02:14:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 918D1C433EF; Mon, 10 Apr 2023 02:14:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681092850; bh=pXSNSEY080dCZ45hxP1p6QKFX6fqVzj/5je/deUizYA=; h=From:To:Cc:Subject:Date:From; b=n0DnDTV39nOj54ijI8xX14a/fVfk9sb29YAwpg1Njihu112/Z2WuHhSez2wB3VT5+ hDMhWrJ0w4tA2L4t7IM282Nh8c74N5OgCX2zCqgqrmIWR7qDHHK/m4FOfk1D8oCJKC yLs5EfczK6jb6+70E8GlxQhvpLO8V3hdnSHeXDpKHxXJE7jsmUFOu3SpV4BTuVdHN2 SaLsZ/mG/9j9Gux99gVA4vf/XAfnj9XLdxddMh3/TWN/roBztJ17IdcJ2U+WJgnRjR 2qB6HZSUggm50IScvP1fzkgbLudZvtJZIRDH3tVqajaIZI4FY6l/+zfrrZqN+hRMZF /i1a/H21BZKLQ== From: Chao Yu To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu Subject: [PATCH] f2fs: fix to avoid use-after-free for cached IPU bio Date: Mon, 10 Apr 2023 10:14:02 +0800 Message-Id: <20230410021402.1833220-1-chao@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org xfstest generic/019 reports a bug: kernel BUG at mm/filemap.c:1619! RIP: 0010:folio_end_writeback+0x8a/0x90 Call Trace: end_page_writeback+0x1c/0x60 f2fs_write_end_io+0x199/0x420 bio_endio+0x104/0x180 submit_bio_noacct+0xa5/0x510 submit_bio+0x48/0x80 f2fs_submit_write_bio+0x35/0x300 f2fs_submit_merged_ipu_write+0x2a0/0x2b0 f2fs_write_single_data_page+0x838/0x8b0 f2fs_write_cache_pages+0x379/0xa30 f2fs_write_data_pages+0x30c/0x340 do_writepages+0xd8/0x1b0 __writeback_single_inode+0x44/0x370 writeback_sb_inodes+0x233/0x4d0 __writeback_inodes_wb+0x56/0xf0 wb_writeback+0x1dd/0x2d0 wb_workfn+0x367/0x4a0 process_one_work+0x21d/0x430 worker_thread+0x4e/0x3c0 kthread+0x103/0x130 ret_from_fork+0x2c/0x50 The root cause is: after cp_error is set, f2fs_submit_merged_ipu_write() in f2fs_write_single_data_page() tries to flush IPU bio in cache, however f2fs_submit_merged_ipu_write() missed to check validity of @bio parameter, result in submitting random cached bio which belong to other IO context, then it will cause use-after-free issue, fix it by adding additional validity check. Fixes: 0b20fcec8651 ("f2fs: cache global IPU bio") Signed-off-by: Chao Yu --- fs/f2fs/data.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 8064df5f829d..b59b5c7096f3 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -874,6 +874,8 @@ void f2fs_submit_merged_ipu_write(struct f2fs_sb_info *sbi, bool found = false; struct bio *target = bio ? *bio : NULL; + f2fs_bug_on(sbi, !target && !page); + for (temp = HOT; temp < NR_TEMP_TYPE && !found; temp++) { struct f2fs_bio_info *io = sbi->write_io[DATA] + temp; struct list_head *head = &io->bio_list; @@ -2902,7 +2904,8 @@ int f2fs_write_single_data_page(struct page *page, int *submitted, if (unlikely(f2fs_cp_error(sbi))) { f2fs_submit_merged_write(sbi, DATA); - f2fs_submit_merged_ipu_write(sbi, bio, NULL); + if (bio && *bio) + f2fs_submit_merged_ipu_write(sbi, bio, NULL); submitted = NULL; } -- 2.25.1