linux-kernel - Re: [PATCH] i2c: i801: Fix out-of-bounds bug in i801_block_transaction _byte_by

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250616104855.06859f8e@endymion>
Date: Mon, 16 Jun 2025 10:48:55 +0200
From: Jean Delvare <jdelvare@...e.de>
To: Alex Guo <alexguo1023@...il.com>
Cc: andi.shyti@...nel.org, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: i801: Fix out-of-bounds bug in
 i801_block_transaction _byte_by_byte

Hi Alex,

On Sun, 15 Jun 2025 19:33:06 -0400, Alex Guo wrote:
> The data->block[0] variable comes from user. Without proper check,
> the variable may be very large to cause an out-of-bounds bug.
> 
> Fix this bug by checking the value of data->block[0] first.

The same check is already present in i801_smbus_block_transaction() and
i801_i2c_block_transaction(), which are the only 2 functions calling
i801_block_transaction_byte_by_byte(). So the out-of-bounds bug you
describe does not exist.

-- 
Jean Delvare
SUSE L3 Support