From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CC8C6F305 for ; Sat, 23 Aug 2025 03:58:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755921540; cv=none; b=ITwidja6Zbov2pwbzYYcuud9n7NsJXvr19QSH99MrwT0607Vz8gdNGb9bPinmadesPbuPUmrUwID5j9FzUWxBliESvpLrcPNEyMfYud56eiJvUSErsK+pgS3QnVliAtGd8ij3A0vYsmcAGRSYb1yWjB78j0jOIIaimA1meWY/ns= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755921540; c=relaxed/simple; bh=AyTBhS9tCons12pGYOVYquNp/pt5LVa0Cd0EGgWCgdo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b/QDIKBkan7hsJhJHCAzvWNkGAX9A2s+oN+BvLDumyEk364bViD0iGFxNxe3/L8E1NV2MOWdGvMxQw7N1BZ8pSgiydJUnCsnuyDgjnStMP/YIHE2PT2g7WP9i4eDB/PtmEwf4uVBxww9ynK6U9HSxcjmBj9/twvdZlmNSaTqZZQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=O7SvdIpz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="O7SvdIpz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74925C4CEE7; Sat, 23 Aug 2025 03:58:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755921539; bh=AyTBhS9tCons12pGYOVYquNp/pt5LVa0Cd0EGgWCgdo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O7SvdIpzKa9nvJM5keS7KB0e10J7HTE6NkkfuzZnZwLhwewo7rhAGRBBBv0p90TrO eAQpebaWrbsCtkPaL8J5T/B7UjRet2KOW7/VRFFmAE71Xb8vw+m0thQTglIamW3Qv2 +rKTCslsusq/n+rMqOJC6tapNfz7SibHeK9XFVTByykNce0wG6E8rMDgfYPuvabkG9 x7CajpJ0i6Q4tRv4ZnGJ6IC4hrzCYixbHOQnE1w28LayyfdYqhIPMeG0hXnIi4fk5z soApr8v6gbv2J2Bn5oMTViHlUmw6hLqT8Jy92ZtVGLrGz7IJWbFM7rCdx+WgYFvmjf Q4GmUobKkm05w== From: Sasha Levin To: stable@vger.kernel.org Cc: Chao Yu , stable@kernel.org, Jiaming Zhang , Jaegeuk Kim , Sasha Levin Subject: [PATCH 5.15.y] f2fs: fix to avoid out-of-boundary access in dnode page Date: Fri, 22 Aug 2025 23:58:56 -0400 Message-ID: <20250823035856.1823032-1-sashal@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <2025082106-carbon-scribing-5927@gregkh> References: <2025082106-carbon-scribing-5927@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chao Yu [ Upstream commit 77de19b6867f2740cdcb6c9c7e50d522b47847a4 ] As Jiaming Zhang reported: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data(). Cc: stable@kernel.org Reported-by: Jiaming Zhang Closes: https://groups.google.com/g/syzkaller/c/-ZnaaOOfO3M Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim [ replaced f2fs_err_ratelimited() with f2fs_err() ] Signed-off-by: Sasha Levin --- fs/f2fs/node.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index ae6d65f2ea06..e5a06a65a539 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -798,6 +798,16 @@ int f2fs_get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode) for (i = 1; i <= level; i++) { bool done = false; + if (nids[i] && nids[i] == dn->inode->i_ino) { + err = -EFSCORRUPTED; + f2fs_err(sbi, + "inode mapping table is corrupted, run fsck to fix it, " + "ino:%lu, nid:%u, level:%d, offset:%d", + dn->inode->i_ino, nids[i], level, offset[level]); + set_sbi_flag(sbi, SBI_NEED_FSCK); + goto release_pages; + } + if (!nids[i] && mode == ALLOC_NODE) { /* alloc new node */ if (!f2fs_alloc_nid(sbi, &(nids[i]))) { -- 2.50.1