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 61ADB2264CB for ; Sun, 21 Dec 2025 18:40:54 +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=1766342455; cv=none; b=Da/vwOhmQVtDk2WIUi9wONHflnaIIWOuNjV/Hd7W0y96V+FSp2me417Iqbu1vQMYWoe3cUsZMEWBZ4iA4sq1BUz6+6CJ2WLx3Z0Es5FrU0TQqUWJJ59a81ZU0k2TuBVhlHAfkr/PgchIb/igAut5vKigsvNObhxZvEIdvxmqNaY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766342455; c=relaxed/simple; bh=e4o82K3DWb8DWSYkfpweQ5e+H4cr0iEUNaMkDOOJP/o=; h=Date:To:From:Subject:Message-Id; b=Za3CLhyLoaK2PpS25ddI14TbST+H57ilLyoOoIULwVIeNLle17v9ny5zkVNkifs6mahWN/05+sSPoaMJH3i+wRXDfOB+Z7N4Yk3juNmJdyEzh8cB0KjSnl6PN/rg4fdqfg750DXOJBO9JgBCT6wkyprzaKZc+PBVOC4n0JrjryA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=fk5Wx2t3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="fk5Wx2t3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF4CAC4CEFB; Sun, 21 Dec 2025 18:40:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1766342454; bh=e4o82K3DWb8DWSYkfpweQ5e+H4cr0iEUNaMkDOOJP/o=; h=Date:To:From:Subject:From; b=fk5Wx2t3aRIm5KImme/tCjJ0HiDXgh5vMEWfB3JceyGl4jA+Y7944qv1gjcBFtc56 trxLpHilHQIsG2oSU/l6LVEcgmuai1q4ZSIhwkg6JrOzgRnXjc8DFZWgoA6VVQgIud nFn/B32Ef8tyJQPgHzVW5Y+Jnnglx/1cz7jgIcVE= Date: Sun, 21 Dec 2025 10:40:54 -0800 To: mm-commits@vger.kernel.org,piaojun@huawei.com,mark@fasheh.com,junxiao.bi@oracle.com,joseph.qi@linux.alibaba.com,jlbec@evilplan.org,heming.zhao@suse.com,gechangwei@live.cn,eadavis@qq.com,akpm@linux-foundation.org From: Andrew Morton Subject: + ocfs2-fix-oob-in-__ocfs2_find_path.patch added to mm-nonmm-unstable branch Message-Id: <20251221184054.BF4CAC4CEFB@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: ocfs2: fix oob in __ocfs2_find_path has been added to the -mm mm-nonmm-unstable branch. Its filename is ocfs2-fix-oob-in-__ocfs2_find_path.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-fix-oob-in-__ocfs2_find_path.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Edward Adam Davis Subject: ocfs2: fix oob in __ocfs2_find_path Date: Fri, 19 Dec 2025 16:31:52 +0800 syzbot constructed a corrupted image, which resulted in el->l_count from the b-tree extent block being 0. Since the length of the l_recs array depends on l_count, reading its member e_blkno triggered the out-of-bounds access reported by syzbot in [1]. The loop terminates when l_count is 0, similar to when next_free is 0. [1] UBSAN: array-index-out-of-bounds in fs/ocfs2/alloc.c:1838:11 index 0 is out of range for type 'struct ocfs2_extent_rec[] __counted_by(l_count)' (aka 'struct ocfs2_extent_rec[]') Call Trace: __ocfs2_find_path+0x606/0xa40 fs/ocfs2/alloc.c:1838 ocfs2_find_leaf+0xab/0x1c0 fs/ocfs2/alloc.c:1946 ocfs2_get_clusters_nocache+0x172/0xc60 fs/ocfs2/extent_map.c:418 ocfs2_get_clusters+0x505/0xa70 fs/ocfs2/extent_map.c:631 ocfs2_extent_map_get_blocks+0x202/0x6a0 fs/ocfs2/extent_map.c:678 ocfs2_read_virt_blocks+0x286/0x930 fs/ocfs2/extent_map.c:1001 ocfs2_read_dir_block fs/ocfs2/dir.c:521 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:728 [inline] ocfs2_find_entry+0x3e4/0x2090 fs/ocfs2/dir.c:1120 ocfs2_find_files_on_disk+0xdf/0x310 fs/ocfs2/dir.c:2023 ocfs2_lookup_ino_from_name+0x52/0x100 fs/ocfs2/dir.c:2045 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x326/0x770 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x319/0x660 fs/ocfs2/super.c:461 ocfs2_initialize_super fs/ocfs2/super.c:2196 [inline] ocfs2_fill_super+0x4432/0x65b0 fs/ocfs2/super.c:993 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] Link: https://lkml.kernel.org/r/tencent_4D99464FA28D9225BE0DBA923F5DF6DD8C07@qq.com Signed-off-by: Edward Adam Davis Reported-by: syzbot+151afab124dfbc5f15e6@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=151afab124dfbc5f15e6 Reviewed-by: Heming Zhao Acked-by: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Changwei Ge Cc: Jun Piao Signed-off-by: Andrew Morton --- fs/ocfs2/alloc.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/fs/ocfs2/alloc.c~ocfs2-fix-oob-in-__ocfs2_find_path +++ a/fs/ocfs2/alloc.c @@ -1812,14 +1812,15 @@ static int __ocfs2_find_path(struct ocfs ret = -EROFS; goto out; } - if (le16_to_cpu(el->l_next_free_rec) == 0) { + if (!el->l_next_free_rec || !el->l_count) { ocfs2_error(ocfs2_metadata_cache_get_super(ci), - "Owner %llu has empty extent list at depth %u\n", + "Owner %llu has empty extent list at depth %u\n" + "(next free=%u count=%u)\n", (unsigned long long)ocfs2_metadata_cache_owner(ci), - le16_to_cpu(el->l_tree_depth)); + le16_to_cpu(el->l_tree_depth), + le16_to_cpu(el->l_next_free_rec), le16_to_cpu(el->l_count)); ret = -EROFS; goto out; - } for(i = 0; i < le16_to_cpu(el->l_next_free_rec) - 1; i++) { _ Patches currently in -mm which might be from eadavis@qq.com are ocfs2-fix-oob-in-__ocfs2_find_path.patch