linux-kernel - Re: [PATCH] jfs: Fix array-index-out-of-bounds in diFree

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Date: Fri, 26 Apr 2024 10:42:41 +0900
From: Jeongjun Park <aha310510@...il.com>
To: willy@...radead.org
Cc: brauner@...nel.org,
	jfs-discussion@...ts.sourceforge.net,
	jlayton@...nel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzbot+241c815bda521982cb49@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] jfs: Fix array-index-out-of-bounds in diFree

Matthew Wilcox wrote:
> In your earlier mail, you said the large value was found in db_agl2size.
> If the problem is in agstart then diRead() is the right place to check it.

Oh, I was so distracted last time that I wrote the explanation
incorrectly. I'm sorry.

To explain it accurately, if you pass a very large value to agstart
and set the value passed to db_agl2size to be small, it can be
manipulated so that a value greater than MAXAG is output when the
"agstart >> db_agl2size" operation is performed.
This results in an out-of-bounds vulnerability.

And the final patch before is the one that fixes diRead().

Thanks.