Kernel panic with the b44 driver in 2.6.35-rc1

Kernel panic with the b44 driver in 2.6.35-rc1

[news.gmane.org]

Hello everybody,

I have a kernel panic at startup with the b44 driver with the 2.6.35-rc1
kernel. I have submitted a bug report (see
https://bugzilla.kernel.org/show_bug.cgi?id=16074) but until know, I
din't get any answer yet. Does anybody knows what's happening. I have
tried several git-bisect run but I didn't find any conclusive result.
The first bad-commit was different each time and if I revert it, the
problem still occurs anyway.

Thanks in advance for your help,
François Valenduc

Re: Kernel panic with the b44 driver in 2.6.35-rc1

[John W. Linville]

On Mon, May 31, 2010 at 09:58:43PM +0200, news.gmane.org wrote:

> I have a kernel panic at startup with the b44 driver with the 2.6.35-rc1
> kernel. I have submitted a bug report (see
> https://bugzilla.kernel.org/show_bug.cgi?id=16074) but until know, I
> din't get any answer yet. Does anybody knows what's happening. I have
> tried several git-bisect run but I didn't find any conclusive result.
> The first bad-commit was different each time and if I revert it, the
> problem still occurs anyway.

This patch is already on its way to Linus -- it should fix the problem
you are seeing:

commit da1fdb02d9200ff28b6f3a380d21930335fe5429
Author: Christoph Fritz <chf.fritz@googlemail.com>
Date:   Fri May 28 10:45:59 2010 +0200

    ssb: fix NULL ptr deref when pcihost_wrapper is used
    
    Ethernet driver b44 does register ssb by it's pcihost_wrapper
    and doesn't set ssb_chipcommon. A check on this value
    introduced with commit d53cdbb94a52a920d5420ed64d986c3523a56743
    and ea2db495f92ad2cf3301623e60cb95b4062bc484 triggers:
    
    BUG: unable to handle kernel NULL pointer dereference at 00000010
    IP: [<c1266c36>] ssb_is_sprom_available+0x16/0x30
    
    Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
    Signed-off-by: John W. Linville <linville@tuxdriver.com>

-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.

Re: Kernel panic with the b44 driver in 2.6.35-rc1

[François Valenduc]

Le 01/06/10 15:33, John W. Linville a écrit :
> On Mon, May 31, 2010 at 09:58:43PM +0200, news.gmane.org wrote:
> 
>> I have a kernel panic at startup with the b44 driver with the 2.6.35-rc1
>> kernel. I have submitted a bug report (see
>> https://bugzilla.kernel.org/show_bug.cgi?id=16074) but until know, I
>> din't get any answer yet. Does anybody knows what's happening. I have
>> tried several git-bisect run but I didn't find any conclusive result.
>> The first bad-commit was different each time and if I revert it, the
>> problem still occurs anyway.
> 
> This patch is already on its way to Linus -- it should fix the problem
> you are seeing:
> 
> commit da1fdb02d9200ff28b6f3a380d21930335fe5429
> Author: Christoph Fritz <chf.fritz@googlemail.com>
> Date:   Fri May 28 10:45:59 2010 +0200
> 
>     ssb: fix NULL ptr deref when pcihost_wrapper is used
>     
>     Ethernet driver b44 does register ssb by it's pcihost_wrapper
>     and doesn't set ssb_chipcommon. A check on this value
>     introduced with commit d53cdbb94a52a920d5420ed64d986c3523a56743
>     and ea2db495f92ad2cf3301623e60cb95b4062bc484 triggers:
>     
>     BUG: unable to handle kernel NULL pointer dereference at 00000010
>     IP: [<c1266c36>] ssb_is_sprom_available+0x16/0x30
>     
>     Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
>     Signed-off-by: John W. Linville <linville@tuxdriver.com>
> 
This patch indeed solve my problem.

Thanks for your help,
François Valenduc