linux-kernel - Re: [PATCH] drm/amd/amdgpu/amdgpu_ttm: Handle return NULL error from ioremap_nocache

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Date:   Tue, 24 Jan 2017 17:11:44 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <deathsimple@...afone.de>
Cc:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        Dave Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/amd/amdgpu/amdgpu_ttm: Handle return NULL error from ioremap_nocache

On Tue, Jan 24, 2017 at 4:55 AM, Christian König
<deathsimple@...afone.de> wrote:
> Am 24.01.2017 um 10:25 schrieb Arvind Yadav:
>>
>> Here, If ioremap_nocache will fail. It will return NULL.
>> Kernel can run into a NULL-pointer dereference.
>> This error check will avoid NULL pointer dereference.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>
>
> I'm not 100% sure if ioremap_nocache() can actually return NULL on platforms
> where this matters, but if that's the case the patch looks reasonable on
> first glance.
>
> So it is Reviewed-by: Christian König <christian.koenig@....com>.
>

Applied this and the radeon patch.

Alex

> Regards,
> Christian.
>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> index 8e35c1f..610c88f 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> @@ -552,6 +552,8 @@ static int amdgpu_ttm_io_mem_reserve(struct
>> ttm_bo_device *bdev, struct ttm_mem_
>>                         mem->bus.addr =
>>                                 ioremap_nocache(mem->bus.base +
>> mem->bus.offset,
>>                                                 mem->bus.size);
>> +               if (!mem->bus.addr)
>> +                       return -ENOMEM;
>>                 /*
>>                  * Alpha: Use just the bus offset plus
>
>
>
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> dri-devel@...ts.freedesktop.org
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