linux-kernel - Re: [PATCH] fix writing to unintended memory in pkt_generic

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Message-ID: <20071106225012.GK8181@ftp.linux.org.uk>
Date:	Tue, 6 Nov 2007 22:50:12 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix writing to unintended memory in pkt_generic_packet(); drivers/block/pktcdvd.c

On Tue, Nov 06, 2007 at 11:43:12PM +0100, Roel Kluin wrote:
> CDROM_PACKET_SIZE is added as an offset to the pointer to unsigned char cmd[16].
> The adjusted pointer is then used as a destination address in a call to
> memset(). However, when CDROM_PACKET_SIZE is added to the pointer, it is
> automatically scaled by the size of cmd, which is 16. This results in the call
> to memset() writing to unintended memory.

What are you talking about?  rq->cmd is an array, not a pointer to array.
When it occurs as an argument of +, it decays to pointer to array element.
Please, learn C.
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