netdev - Re: [PATCH] dccp: handle invalid feature options length

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Message-ID: <20110506195733.GA3527@gerrit.erg.abdn.ac.uk>
Date:	Fri, 6 May 2011 21:57:33 +0200
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	davem@...emloft.net, dccp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] dccp: handle invalid feature options length

Quoting Dan Rosenberg:
| A length of zero (after subtracting two for the type and len fields) for
| the DCCPO_{CHANGE,CONFIRM}_{L,R} options will cause an underflow due to
| the subtraction.  The subsequent code may read past the end of the
| options value buffer when parsing.  I'm unsure of what the consequences
| of this might be, but it's probably not good.
| 
Please disregard my earlier message, I erred.
Dan is right, his patch is correct and definitively valid.
A length of 0 would be cast to 0xff and then cause buffer overrun.

| Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
| Cc: stable@...nel.org
Acked-by: Gerrit Renker <gerrit@....abdn.ac.uk>
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