Re: [PATCH v3] drm/gma500: fix double freeing

[Patrik Jakobsson]

On Thu, Apr 7, 2016 at 5:52 PM, Sudip Mukherjee
<sudipm.mukherjee@xxxxxxxxx> wrote:
> On Wednesday 09 December 2015 05:50 PM, Patrik Jakobsson wrote:
>>
>> On Wed, Dec 9, 2015 at 12:53 PM, Sudip Mukherjee
>> <sudipm.mukherjee@xxxxxxxxx> wrote:
>>>
>>> On Thu, Oct 08, 2015 at 06:17:48PM +0530, Sudip Mukherjee wrote:
>>>>
>>>> We are allocating backing using psbfb_alloc() and so
>>>> backing->stolen is always true. So we were freeing backing two times.
>>>> Moreover if we follow the execution path then we should be freeing
>>>> backing after we have released the helper. So remove the one which frees
>>>> backing before the helper is released.
>>>> While at it the error labels are also renamed to give a meaningful
>>>> name.
>>>>
>>>> Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
>>>> Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
>>>> ---
>>>
>>>
>>> This patch was never picked up. It will not apply now.
>>>
>>> Daniel, please let me know if you want me to resend after making
>>> necessary changes.
>>
>>
>> I will pick this up and pass it along to Dave. Sorry for the delay.
>
>
> This was not picked up. But I guess it is still true. Do you want me to
> rebase and send it again..

I already have it rebased, will send it out later tonight. For real this time ;)

Thanks
Patrik

>
> regards
> sudip
>
>
>>
>> -Patrik
>>
>>>
>>> regards
>>> sudip
>>>
>>>>   drivers/gpu/drm/gma500/framebuffer.c | 13 ++++---------
>>>>   1 file changed, 4 insertions(+), 9 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/gma500/framebuffer.c
>>>> b/drivers/gpu/drm/gma500/framebuffer.c
>>>> index 2eaf1b3..52e2bf3 100644
>>>> --- a/drivers/gpu/drm/gma500/framebuffer.c
>>>> +++ b/drivers/gpu/drm/gma500/framebuffer.c
>>>> @@ -411,7 +411,7 @@ static int psbfb_create(struct psb_fbdev *fbdev,
>>>>        info = drm_fb_helper_alloc_fbi(&fbdev->psb_fb_helper);
>>>>        if (IS_ERR(info)) {
>>>>                ret = PTR_ERR(info);
>>>> -             goto out_err1;
>>>> +             goto err_unlock;
>>>>        }
>>>>        info->par = fbdev;
>>>>
>>>> @@ -419,7 +419,7 @@ static int psbfb_create(struct psb_fbdev *fbdev,
>>>>
>>>>        ret = psb_framebuffer_init(dev, psbfb, &mode_cmd, backing);
>>>>        if (ret)
>>>> -             goto out_unref;
>>>> +             goto err_release;
>>>>
>>>>        fb = &psbfb->base;
>>>>        psbfb->fbdev = info;
>>>> @@ -465,14 +465,9 @@ static int psbfb_create(struct psb_fbdev *fbdev,
>>>>
>>>>        mutex_unlock(&dev->struct_mutex);
>>>>        return 0;
>>>> -out_unref:
>>>> -     if (backing->stolen)
>>>> -             psb_gtt_free_range(dev, backing);
>>>> -     else
>>>> -             drm_gem_object_unreference(&backing->gem);
>>>> -
>>>> +err_release:
>>>>        drm_fb_helper_release_fbi(&fbdev->psb_fb_helper);
>>>> -out_err1:
>>>> +err_unlock:
>>>>        mutex_unlock(&dev->struct_mutex);
>>>>        psb_gtt_free_range(dev, backing);
>>>>        return ret;
>>>> --
>>>> 1.9.1
>>>>
>