linux-kernel - Re: [PATCH] drm: nouveau: fix nvbe leakage

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Message-ID: <CA+5g0SKCdnCCzHBXFN5JYyG5Sno14Tud78rN_MvygXkEg0dr_A@mail.gmail.com>
Date:	Mon, 7 Oct 2013 20:36:44 -0300
From:	Felipe Pena <felipensp@...il.com>
To:	Ben Skeggs <bskeggs@...hat.com>
Cc:	"Geyslan G. Bem" <geyslan@...il.com>, airlied@...ux.ie,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-br <kernel-br@...glegroups.com>
Subject: Re: [PATCH] drm: nouveau: fix nvbe leakage

Hi,

On Mon, Oct 7, 2013 at 7:35 PM, Ben Skeggs <bskeggs@...hat.com> wrote:
> ----- Original Message -----
>> From: "Geyslan G. Bem" <geyslan@...il.com>
>> To: airlied@...ux.ie, bskeggs@...hat.com, dri-devel@...ts.freedesktop.org
>> Cc: linux-kernel@...r.kernel.org, kernel-br@...glegroups.com, "Geyslan G. Bem" <geyslan@...il.com>
>> Sent: Tuesday, 8 October, 2013 8:14:26 AM
>> Subject: [PATCH] drm: nouveau: fix nvbe leakage
>>
>> Free memory allocated to nvbe when returning NULL.
>>
>> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
> NACK.  ttm_dma_tt_init() calls the destructor if it fails, which frees the memory.
>
> Ben.
>

But ttm_tt_destroy() just handles the ttm_tt part from nvbe, the nvbe
pointer itself is not being free'd.

>> ---
>>  drivers/gpu/drm/nouveau/nouveau_sgdma.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
>> b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
>> index 0843ebc..af8b66d 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
>> @@ -105,6 +105,9 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
>>               nvbe->ttm.ttm.func = &nv50_sgdma_backend;
>>
>>       if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
>> +     {
>> +             kfree(nvbe);
>>               return NULL;
>> +     }
>>       return &nvbe->ttm.ttm;
>>  }
>> --
>> 1.8.4
>>
>>
> --
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-- 
Regards,
Felipe Pena
--
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