linux-kernel - Re: [PATCH] drm/mediatek: Fix potential memory leak if vmap() fail

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Message-ID: <1784da38-52ae-668a-db2a-49d60f2be80e@loongson.cn>
Date:   Thu, 6 Jul 2023 20:46:07 +0800
From:   suijingfeng <suijingfeng@...ngson.cn>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] drm/mediatek: Fix potential memory leak if vmap() fail

Hi, Thanks a lot!


On 2023/7/6 19:39, Matthias Brugger wrote:
>
>
> On 26/06/2023 20:58, Sui Jingfeng wrote:
>> Also return -ENOMEM if such a failure happens, the implement should take
>> responsibility for the error handling.
>>
>> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_drm_gem.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c 
>> b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
>> index a25b28d3ee90..9f364df52478 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
>> @@ -247,7 +247,11 @@ int mtk_drm_gem_prime_vmap(struct drm_gem_object 
>> *obj, struct iosys_map *map)
>>         mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
>>                      pgprot_writecombine(PAGE_KERNEL));
>> -
>> +    if (!mtk_gem->kvaddr) {
>> +        kfree(sgt);
>> +        kfree(mtk_gem->pages);
>> +        return -ENOMEM;
>> +    }
>
> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
>
>>   out:
>>       kfree(sgt);
>>       iosys_map_set_vaddr(map, mtk_gem->kvaddr);