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

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Message-Id: <200806111205.10433.mb@bu3sch.de>
Date:	Wed, 11 Jun 2008 12:05:10 +0200
From:	Michael Buesch <mb@...sch.de>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	vegard.nossum@...il.com, miles.lane@...il.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155

On Wednesday 11 June 2008 02:58:44 FUJITA Tomonori wrote:
> On Tue, 10 Jun 2008 16:50:26 +0200
> Michael Buesch <mb@...sch.de> wrote:
> 
> > On Tuesday 10 June 2008 16:42:41 Vegard Nossum wrote:
> > > This change comes from
> > > 
> > > commit 353c409463ecba63c3a41a992d3f5fba935eada9
> > > Author: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > > Date:   Fri May 23 19:02:30 2008 +0000
> > 
> > 
> > Ok, FUJITA Tomonori, please make sure a patch like the following goes
> > into the same trees that you submitted commit 353c409 to.
> > Also make sure to check b43legacy. I _guess_ you might have added
> > the same bug there.
> 
> Ah, sorry about the bug.
> 
> From a quick look, mainline needs the same fix too?
> 
> b43_dma_mapping_error calls unmap_descbuffer() on the failure, which
> assumes that ring->dev is set up properly.

Yeah ok. That's an unlikely error path.
The new bug is in the main path which will always trigger.

Next time please send _any_ patch for review to me and to the wireless list.
Please tell me which trees this bug has been merged to. Is it already in
Linus' tree?

-- 
Greetings Michael.
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