linux-kernel - Re: [PATCH v2] drm/mediatek: Fix potential memory leak if vmap() fail

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Date:   Thu, 27 Jul 2023 15:24:12 +0800
From:   suijingfeng <suijingfeng@...ngson.cn>
To:     CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "airlied@...il.com" <airlied@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amergnat@...libre.com" <amergnat@...libre.com>,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v2] drm/mediatek: Fix potential memory leak if vmap() fail

Hi,


Thanks a lot!


On 2023/7/27 09:47, CK Hu (胡俊光) wrote:
> Hi, Jingfeng:
>
> On Thu, 2023-07-06 at 21:40 +0800, Sui Jingfeng wrote:
> >   
> > External email : Please do not click links or open attachments until
> > you have verified the sender or the content.
> >  Also return -ENOMEM if such a failure happens, the implement should
> > take
> > responsibility for the error handling.
>
> Reviewed-by: CK Hu <ck.hu@...iatek.com>
>
> > 
> > Fixes: 3df64d7b0a4f ("drm/mediatek: Implement gem prime vmap/vunmap
> > function")
> > Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> > Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>
> > 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;
> > +}
> >  out:
> >  kfree(sgt);
> >  iosys_map_set_vaddr(map, mtk_gem->kvaddr);
> > -- 
> > 2.34.1
>
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