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

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Message-ID: <78b023a0-ce6d-80e2-c8d0-d3d6fde1c928@gmail.com>
Date:   Thu, 6 Jul 2023 13:39:01 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Sui Jingfeng <suijingfeng@...ngson.cn>,
        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
Subject: Re: [PATCH] drm/mediatek: Fix potential memory leak if vmap() fail



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);