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

[suijingfeng]

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 at mediatek.com>
>
> > 
> > Fixes: 3df64d7b0a4f ("drm/mediatek: Implement gem prime vmap/vunmap
> > function")
> > Reviewed-by: Matthias Brugger <matthias.bgg at gmail.com>
> > Reviewed-by: Alexandre Mergnat <amergnat at baylibre.com>
> > Signed-off-by: Sui Jingfeng <suijingfeng at loongson.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
>
> ************* MEDIATEK Confidentiality Notice ********************
> The information contained in this e-mail message (including any
> attachments) may be confidential, proprietary, privileged, or otherwise
> exempt from disclosure under applicable laws. It is intended to be
> conveyed only to the designated recipient(s). Any use, dissemination,
> distribution, printing, retaining or copying of this e-mail (including its
> attachments) by unintended recipient(s) is strictly prohibited and may
> be unlawful. If you are not an intended recipient of this e-mail, or believe
> that you have received this e-mail in error, please notify the sender
> immediately (by replying to this e-mail), delete any and all copies of
> this e-mail (including any attachments) from your system, and do not
> disclose the content of this e-mail to any other person. Thank you!