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

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Date: Thu, 25 Apr 2024 21:44:33 +0900
From: Jeongjun Park <aha310510@...il.com>
To: willy@...radead.org
Cc: brauner@...nel.org,
	eadavis@...com,
	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

Through direct testing and debugging, I've determined that this 
vulnerability occurs when mounting an incorrect image, leading to 
the potential passing of an excessively large value to 
'sbi->bmap->db_agl2size'. Importantly, there have been no instances 
of memory corruption observed within 'sbi->bmap->db_agl2size'. 

Therefore, I think implementing a patch that terminates the 
function in cases where an invalid value is detected.

Thanks.