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

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Message-ID: <20250616104644.2066693e@endymion>
Date: Mon, 16 Jun 2025 10:46:44 +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

Hi Alex,

On Sun, 15 Jun 2025 19:28:57 -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.

This check is already present in i801_smbus_block_transaction(), which
is the only place where i801_block_transaction_by_block() is being
called. So the out-of-bounds bug you describe does not exist.

-- 
Jean Delvare
SUSE L3 Support