netdev - Re: [Bug 79811] New: ethernet/dec/tulip/tulip_core.c:592: array index check in wrong place ?

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Date:	Thu, 10 Jul 2014 17:01:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	stephen@...workplumber.org
Cc:	netdev@...r.kernel.org
Subject: Re: [Bug 79811] New: ethernet/dec/tulip/tulip_core.c:592: array
 index check in wrong place ?

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Thu, 10 Jul 2014 05:50:22 -0700

> Subject: [Bug 79811] New: ethernet/dec/tulip/tulip_core.c:592: array index check in wrong place ?
 ...
> ethernet/dec/tulip/tulip_core.c:592]: (style) Array index 'j' is used before
> limits check.
> 
>             for (j = 0; buf[j] != 0xee && j < 1600; j++)
> 
> Suggest put limit check before index use.

This code has never actually ever been compiled for at least a decade
or two, it's ifdef protected against "way_too_many_messages" which
nothing will ever define.

This is what really eats me about automated tools sometimes, and in this case
I have two gripes:

1) The tool doesn't take into consideration that the code might never
   be compiled.

2) The code actually is buggy is far more important ways, it takes a DMA mapping
   cookie and dereferences it as a CPU pointer:

			u8 *buf = (u8 *)(tp->rx_ring[i].buffer1);

   which is guaranteed to not work.

So in actuality this entire code block should be rewritten or removed.
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