linux-kernel - Re: [PATCH] drm/lima: fix a memleak in lima_heap

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Date: Tue, 16 Jan 2024 09:24:37 +0800
From: Qiang Yu <yuq825@...il.com>
To: Zhipeng Lu <alexious@....edu.cn>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Vasily Khoruzhick <anarsoul@...il.com>, dri-devel@...ts.freedesktop.org, 
	lima@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/lima: fix a memleak in lima_heap_alloc

Thanks for the fix. As the error handling gets longer and duplicated,
could you rearrange them like the lima_gem_submit():
err_out2:
    dma_unmap_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
err_out1:
    kfree(bo->base.sgt);
    bo->base.sgt = NULL;
err_out0:
    sg_free_table(&sgt);
    return ret.

Regards,
Qiang

On Fri, Jan 12, 2024 at 4:49 PM Zhipeng Lu <alexious@....edu.cn> wrote:
>
> When lima_vm_map_bo fails, the resources need to be deallocated, or
> there will be memleaks.
>
> Fixes: 6aebc51d7aef ("drm/lima: support heap buffer creation")
> Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
> ---
>  drivers/gpu/drm/lima/lima_gem.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
> index 4f9736e5f929..824ed22141c7 100644
> --- a/drivers/gpu/drm/lima/lima_gem.c
> +++ b/drivers/gpu/drm/lima/lima_gem.c
> @@ -92,8 +92,13 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
>
>         if (vm) {
>                 ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT);
> -               if (ret)
> +               if (ret) {
> +                       dma_unmap_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
> +                       sg_free_table(&sgt);
> +                       kfree(bo->base.sgt);
> +                       bo->base.sgt = NULL;
>                         return ret;
> +               }
>         }
>
>         bo->heap_size = new_size;
> --
> 2.34.1
>