linux-kernel - Re: [Patch] ariadne: fix possible null dereference

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Date:	Sun, 6 Mar 2011 21:00:13 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	j223yang@...et.uwaterloo.ca, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch] ariadne: fix possible null dereference

On Sun, Mar 6, 2011 at 20:11, Randy Dunlap <rdunlap@...otime.net> wrote:
> On Sun, 6 Mar 2011 02:08:32 -0500 j223yang@...et.uwaterloo.ca wrote:
>
>> Hi Randy,
>> I have tested my patch, and it is ok now.
>> Could you please try patching again? Sorry for previous trouble.
>> Thank you!
>
> Acked-by: Randy Dunlap <rdunlap@...otime.net>

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

>> ------------------------------------------------------
>> This patch fixes bugzilla #13853:
>> https://bugzilla.kernel.org/show_bug.cgi?id=13853
>>
>> The patch removes dereference of 'dev' after testing for NULL.
>>
>> Signed-off-by: Jinqiu Yang<crindy646@...il.com>
>> ---
>>  ariadne.c |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ariadne.c b/drivers/net/ariadne.c
>> --- a/drivers/net/ariadne.c   2011-03-04 11:16:42.332164362 -0500
>> +++ b/drivers/net/ariadne.c   2011-03-05 21:11:52.949164759 -0500
>> @@ -420,7 +420,7 @@ static inline void ariadne_reset(struct
>>  static irqreturn_t ariadne_interrupt(int irq, void *data)
>>  {
>>      struct net_device *dev = (struct net_device *)data;
>> -    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
>> +    volatile struct Am79C960 *lance;
>>      struct ariadne_private *priv;
>>      int csr0, boguscnt;
>>      int handled = 0;
>> @@ -430,6 +430,7 @@ static irqreturn_t ariadne_interrupt(int
>>       return IRQ_NONE;
>>      }
>>
>> +    lance = (struct Am79C960 *)dev->base_addr;
>>      lance->RAP = CSR0;                       /* PCnet-ISA Controller Status */
>>
>>      if (!(lance->RDP & INTR))                /* Check if any interrupt has been */

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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