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 3EA8D38B151; Mon, 6 Apr 2026 18:14:27 +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=1775499268; cv=none; b=Pr7I4fpH6ElLNsZ1/91jhDVU8bvgwMYkWAMIC86VZYBgnEqX+YGbmHucmpAR4oAcfI7mWkKibiuEASpVrOe8rwplJLr/eJreJfxqTGItPR5YvaxnMjQB/QgrXyXffFbqAyK4d0k2Bzsqt0qYASamBl8YrdGIKjkgLsDu4BqD4zU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775499268; c=relaxed/simple; bh=+Gm+/6HacbzoW6TB8Iw0vbddQJwbmOqQUW23cnjV89g=; h=Date:To:From:Subject:Message-Id; b=rrsHFEFT5/f02bPv/HgDkSLZNoCM/WtyCFLrj0mv82WoBD/9lXfsbkw6bxdo5HXBproR4kPaq7HY+bzxpJPdcHAnRD2nEGcwmU8vAuRGe8rF3thcdqgKrOT1ubb6Fjx8+Xg3iXxeXkn9W8hGvPD9lIGVzNQg1zS7uMiFhN81Lnw= 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=pNYe3k2M; 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="pNYe3k2M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF27CC4CEF7; Mon, 6 Apr 2026 18:14:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1775499267; bh=+Gm+/6HacbzoW6TB8Iw0vbddQJwbmOqQUW23cnjV89g=; h=Date:To:From:Subject:From; b=pNYe3k2MrpGoIQP6k5IDuYbqdsCeL0zklSBH/7G1ynZlYcRlUzRfsQoZKOkheMUSz 4sVzpEetcna3sQb65rRcjIsj+n4JGiser3nrcUcxNvTl6E8d857rGhFl8HxJZLSvN3 KaF+F8lRsvaMR/39O5hWqhV1vxIoc+PY5VXCmTLA= Date: Mon, 06 Apr 2026 11:14:27 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,piaojun@huawei.com,mark@fasheh.com,junxiao.bi@oracle.com,jlbec@evilplan.org,heming.zhao@suse.com,gechangwei@live.cn,joseph.qi@linux.alibaba.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-hotfixes-stable] ocfs2-fix-out-of-bounds-write-in-ocfs2_write_end_inline.patch removed from -mm tree Message-Id: <20260406181427.BF27CC4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: ocfs2: fix out-of-bounds write in ocfs2_write_end_inline has been removed from the -mm tree. Its filename was ocfs2-fix-out-of-bounds-write-in-ocfs2_write_end_inline.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Joseph Qi Subject: ocfs2: fix out-of-bounds write in ocfs2_write_end_inline Date: Fri, 3 Apr 2026 14:38:30 +0800 KASAN reports a use-after-free write of 4086 bytes in ocfs2_write_end_inline, called from ocfs2_write_end_nolock during a copy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on a loop device. The actual bug is an out-of-bounds write past the inode block buffer, not a true use-after-free. The write overflows into an adjacent freed page, which KASAN reports as UAF. The root cause is that ocfs2_try_to_write_inline_data trusts the on-disk id_count field to determine whether a write fits in inline data. On a corrupted filesystem, id_count can exceed the physical maximum inline data capacity, causing writes to overflow the inode block buffer. Call trace (crash path): vfs_copy_file_range (fs/read_write.c:1634) do_splice_direct splice_direct_to_actor iter_file_splice_write ocfs2_file_write_iter generic_perform_write ocfs2_write_end ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949) ocfs2_write_end_inline (fs/ocfs2/aops.c:1915) memcpy_from_folio <-- KASAN: write OOB So add id_count upper bound check in ocfs2_validate_inode_block() to alongside the existing i_size check to fix it. Link: https://lkml.kernel.org/r/20260403063830.3662739-1-joseph.qi@linux.alibaba.com Signed-off-by: Joseph Qi Reported-by: syzbot+62c1793956716ea8b28a@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=62c1793956716ea8b28a Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Changwei Ge Cc: Jun Piao Cc: Heming Zhao Cc: Signed-off-by: Andrew Morton --- fs/ocfs2/inode.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/fs/ocfs2/inode.c~ocfs2-fix-out-of-bounds-write-in-ocfs2_write_end_inline +++ a/fs/ocfs2/inode.c @@ -1505,6 +1505,16 @@ int ocfs2_validate_inode_block(struct su goto bail; } + if (le16_to_cpu(data->id_count) > + ocfs2_max_inline_data_with_xattr(sb, di)) { + rc = ocfs2_error(sb, + "Invalid dinode #%llu: inline data id_count %u exceeds max %d\n", + (unsigned long long)bh->b_blocknr, + le16_to_cpu(data->id_count), + ocfs2_max_inline_data_with_xattr(sb, di)); + goto bail; + } + if (le64_to_cpu(di->i_size) > le16_to_cpu(data->id_count)) { rc = ocfs2_error(sb, "Invalid dinode #%llu: inline data i_size %llu exceeds id_count %u\n", _ Patches currently in -mm which might be from joseph.qi@linux.alibaba.com are ocfs2-validate-dx_root-extent-list-fields-during-block-read.patch ocfs2-remove-empty-extent-list-check-in-ocfs2_dx_dir_lookup_rec.patch ocfs2-validate-extent-block-list-fields-during-block-read.patch ocfs2-remove-redundant-l_next_free_rec-check-in-__ocfs2_find_path.patch