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

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Date: Thu, 25 Apr 2024 23:24:34 +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:
> It should be checked earlier than this.  There's this code in
> dbMount().  Why isn't this catching it?

This vulnerability occurs because a very large value can be passed 
to iagp->agstart. So that code doesn't prevent the vulnerability.