Re: [GIT PULL] x86 fixes for 3.9

From: Matt Fleming
Date: Fri Apr 26 2013 - 05:44:20 EST

On 26/04/13 10:02, Michel Lespinasse wrote:
> On Fri, Apr 26, 2013 at 1:49 AM, Matt Fleming <matt.fleming@xxxxxxxxx> wrote:
>> On 26/04/13 08:43, Michel Lespinasse wrote:
>>> Still seeing the crash.
>>> I went and compared the crash dump with the vmlinux disassembly; the
>>> issue is a NULL pointer dereference in list_for_each_entry_safe().
>>> list_empty() checks that the head node points to itself, but here the
>>> head node has NULL. I think this may be due to gsmi_init() being
>>> called before efivars_init(). Not sure what's the proper fix though.
>> Ohh... I see what you mean. The bug is in variable_is_present() because
>> it accesses __efivars directly, which a) isn't the struct efivars gsmi.c
>> uses and b) hasn't been initialised. Something like this might work.
> [... skipping patch ...]
> Yes, this one fixes it. Thanks !

Thanks for testing!

Linus, did you want to take this one directly?