linux-kernel - Re: [PATCH] dma-buf: cma_heap: Fix memory leak in CMA heap

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Date:   Sat, 9 Jan 2021 09:14:14 +0530
From:   Sumit Semwal <sumit.semwal@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Bing Song <bing.song@....com>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...nel.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        Chris Goldsworthy <cgoldswo@...eaurora.org>,
        Ørjan Eide <orjan.eide@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Simon Ser <contact@...rsion.fr>,
        James Jones <jajones@...dia.com>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] dma-buf: cma_heap: Fix memory leak in CMA heap

Hi John,

On Fri, 8 Jan 2021 at 01:56, John Stultz <john.stultz@...aro.org> wrote:
>
> Bing Song noticed the CMA heap was leaking memory due to a flub
> I made in commit a5d2d29e24be ("dma-buf: heaps: Move heap-helper
> logic into the cma_heap implementation"), and provided this fix
> which ensures the pagelist is also freed on release.
Thanks for your patch.
>
> Cc: Bing Song <bing.song@....com>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Liam Mark <lmark@...eaurora.org>
> Cc: Laura Abbott <labbott@...nel.org>
> Cc: Brian Starkey <Brian.Starkey@....com>
> Cc: Hridya Valsaraju <hridya@...gle.com>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Sandeep Patil <sspatil@...gle.com>
> Cc: Daniel Mentz <danielmentz@...gle.com>
> Cc: Chris Goldsworthy <cgoldswo@...eaurora.org>
> Cc: Ørjan Eide <orjan.eide@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Ezequiel Garcia <ezequiel@...labora.com>
> Cc: Simon Ser <contact@...rsion.fr>
> Cc: James Jones <jajones@...dia.com>
> Cc: linux-media@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Reported-by: Bing Song <bing.song@....com>
> Fixes: a5d2d29e24be ("dma-buf: heaps: Move heap-helper logic into the cma_heap implementation")
> Signed-off-by: John Stultz <john.stultz@...aro.org>

I will queue it up so it gets in the v5.11 cycle.
> ---
>  drivers/dma-buf/heaps/cma_heap.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
> index 3c4e34301172..364fc2f3e499 100644
> --- a/drivers/dma-buf/heaps/cma_heap.c
> +++ b/drivers/dma-buf/heaps/cma_heap.c
> @@ -251,6 +251,9 @@ static void cma_heap_dma_buf_release(struct dma_buf *dmabuf)
>                 buffer->vaddr = NULL;
>         }
>
> +       /* free page list */
> +       kfree(buffer->pages);
> +       /* release memory */
>         cma_release(cma_heap->cma, buffer->cma_pages, buffer->pagecount);
>         kfree(buffer);
>  }
> --
> 2.17.1
>
Best,
Sumit.