linux-kernel - Re: [PATCH] Bluetooth: Prevent buffer overflow in l2cap config request

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Message-ID: <20110628175937.GA23183@joana>
Date:	Tue, 28 Jun 2011 14:59:37 -0300
From:	"Gustavo F. Padovan" <padovan@...fusion.mobi>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	marcel@...tmann.org, davem@...emloft.net,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] Bluetooth: Prevent buffer overflow in l2cap config
 request

Hi Dan,

* Dan Rosenberg <drosenberg@...curity.com> [2011-06-24 08:38:05 -0400]:

> A remote user can provide a small value for the command size field in
> the command header of an l2cap configuration request, resulting in an
> integer underflow when subtracting the size of the configuration request
> header.  This results in copying a very large amount of data via
> memcpy() and destroying the kernel heap.  Check for underflow.
> 
> Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
> Cc: stable <stable@...nel.org>
> ---
>  net/bluetooth/l2cap_core.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

Applied, thanks.

	Gustavo
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