linux-kernel - [PATCH 5.10 36/40] fs: quota: fix array-index-out-of-bounds bug by passing correct argument to vfs_cleanup_quota

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Message-Id: <20201223150517.275754032@linuxfoundation.org>
Date:   Wed, 23 Dec 2020 16:33:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+2643e825238d7aabb37f@...kaller.appspotmail.com,
        Anant Thazhemadam <anant.thazhemadam@...il.com>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH 5.10 36/40] fs: quota: fix array-index-out-of-bounds bug by passing correct argument to vfs_cleanup_quota_inode()

From: Anant Thazhemadam <anant.thazhemadam@...il.com>

commit e51d68e76d604c6d5d1eb13ae1d6da7f6c8c0dfc upstream.

When dquot_resume() was last updated, the argument that got passed
to vfs_cleanup_quota_inode was incorrectly set.

If type = -1 and dquot_load_quota_sb() returns a negative value,
then vfs_cleanup_quota_inode() gets called with -1 passed as an
argument, and this leads to an array-index-out-of-bounds bug.

Fix this issue by correctly passing the arguments.

Fixes: ae45f07d47cc ("quota: Simplify dquot_resume()")
Link: https://lore.kernel.org/r/20201208194338.7064-1-anant.thazhemadam@gmail.com
Reported-by: syzbot+2643e825238d7aabb37f@...kaller.appspotmail.com
Tested-by: syzbot+2643e825238d7aabb37f@...kaller.appspotmail.com
CC: stable@...r.kernel.org
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/quota/dquot.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2455,7 +2455,7 @@ int dquot_resume(struct super_block *sb,
 		ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id,
 					  flags);
 		if (ret < 0)
-			vfs_cleanup_quota_inode(sb, type);
+			vfs_cleanup_quota_inode(sb, cnt);
 	}
 
 	return ret;