linux-kernel - Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping

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Date:	Tue, 10 Jun 2008 16:29:17 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Michael Buesch" <mb@...sch.de>
Cc:	"Miles Lane" <miles.lane@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155

On Tue, Jun 10, 2008 at 4:23 PM, Michael Buesch <mb@...sch.de> wrote:
> On Tuesday 10 June 2008 16:09:37 Miles Lane wrote:
>> BUG: unable to handle kernel NULL pointer dereference at 00000000
>> IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155
>
>
> It seems to crash at
>  60 extern const struct dma_mapping_ops *dma_ops;
>  61
>  62 static inline int dma_mapping_error(dma_addr_t dma_addr)
>  63 {
>  64         if (dma_ops->mapping_error)
>  65                 return dma_ops->mapping_error(dma_addr);
>  66
>  67         return (dma_addr == bad_dma_address);
>  68 }

No, this is wrong.

/* Check if a DMA mapping address is invalid. */
static bool b43_dma_mapping_error(struct b43_dmaring *ring,
                                  dma_addr_t addr,
                                  size_t buffersize, bool dma_to_device)
{
        if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr)))

It crashes on this line ---^


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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