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

[David Miller]

From: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
Date: Fri, 6 May 2011 21:57:33 +0200

> 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@xxxxxxxxxxxxx>
> | Cc: stable@xxxxxxxxxx
> Acked-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>

Great, I'll apply this, thanks!
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/