linux-kernel - Re: [PATCH] drm/amdgpu: fix memory leak

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Date:   Fri, 4 Oct 2019 11:00:15 +0000
From:   Nirmoy <nirmodas@....com>
To:     "Koenig, Christian" <Christian.Koenig@....com>,
        Nirmoy Das <nirmoy.aiemd@...il.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>
CC:     "airlied@...ux.ie" <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Das, Nirmoy" <Nirmoy.Das@....com>
Subject: Re: [PATCH] drm/amdgpu: fix memory leak


On 10/4/19 12:44 PM, Koenig, Christian wrote:
> First of all please send mails regarding amdgpu to the amd-gfx mailing
> list and not lkml/dri-devel.
Okay.
> Am 04.10.19 um 12:17 schrieb Nirmoy Das:
>> In amdgpu_bo_list_ioctl when idr_alloc fails
>> don't return without freeing bo list entry.
>>
>> Fixes: 964d0fbf6301d ("drm/amdgpu: Allow to create BO lists in CS ioctl v3")
>>
>> Signed-off-by: Nirmoy Das <nirmoy.das@....com>
>> ---
>>    drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 2 +-
>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
>> index 7bcf86c61999..c3e5ea544857 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
>> @@ -284,7 +284,7 @@ int amdgpu_bo_list_ioctl(struct drm_device *dev, void *data,
>>    		mutex_unlock(&fpriv->bo_list_lock);
>>    		if (r < 0) {
>>    			amdgpu_bo_list_put(list);
>> -			return r;
>> +			goto error_free;
> NAK, that is a double free. The bo list entries are freed by
> amdgpu_bo_list_put().
Thanks, didn't realize that.
> Regards,
> Christian.

Regards,

Nirmoy

>>    		}
>>    
>>    		handle = r;