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ocfs2: use kzalloc for quota recovery bitmap allocation

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ocfs2 quota recovery allocates a bitmap buffer with kmalloc and does not
fully initialize it.  This can lead to use of uninitialized bits during
quota recovery from a corrupted filesystem image.

Use kzalloc instead to ensure the bitmap is zero-initialized.

Link: https://lore.kernel.org/20260418131048.1052507-1-tristmd@gmail.com
Reported-by: syzbot+7ea0b96c4ddb49fd1a70@syzkaller.appspotmail.com
Signed-off-by: Tristan Madani <tristan@talencesecurity.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Tristan Madani 2026-04-18 13:10:48 +00:00 committed by Andrew Morton
parent 0e75190fe4
commit 93c8c6ea90
1 changed files with 1 additions and 1 deletions
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2
fs/ocfs2/quota_local.c
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@ -302,7 +302,7 @@ static int ocfs2_add_recovery_chunk(struct super_block *sb,
if (!rc)
return -ENOMEM;
rc->rc_chunk = chunk;
rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
rc->rc_bitmap = kzalloc(sb->s_blocksize, GFP_NOFS);
if (!rc->rc_bitmap) {
kfree(rc);
return -ENOMEM;