netdev - Re: [PATCH] irda: prevent integer underflow in IRLMP

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Message-Id: <20101223.100920.48494288.davem@davemloft.net>
Date:	Thu, 23 Dec 2010 10:09:20 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	drosenberg@...curity.com
Cc:	samuel@...tiz.org, netdev@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] irda: prevent integer underflow in IRLMP_ENUMDEVICES

From: Dan Rosenberg <drosenberg@...curity.com>
Date: Wed, 22 Dec 2010 18:58:27 -0500

> If the user-provided len is less than the expected offset, the
> IRLMP_ENUMDEVICES getsockopt will do a copy_to_user() with a very large
> size value.  While this isn't be a security issue on x86 because it will
> get caught by the access_ok() check, it may leak large amounts of kernel
> heap on other architectures.  In any event, this patch fixes it.
> 
> Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>

Applied, thanks.
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