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SubjectRe: [PATCH v2] media: venus: vdec: fixed possible memory leak issue
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Quoting Kieran Bingham (2021-12-06 09:55:54)
> Hi Ameer,
>
> Thank you for investigating the alternative suggestion I made.
>
> Quoting Ameer Hamza (2021-12-04 20:55:04)
> > Fixed coverity warning by freeing the allocated memory before return
>
> We could probably say that fixing the coverity warning isn't so much the
> target of the patch as fixing the memory leak. It's just helpful that
> coverity spotted it for us.
>
>
> I'd write:
>
> The venus_helper_alloc_dpb_bufs() implementation allows an early return
> on an error path when checking the id from ida_alloc_min() which would
> not release the earlier buffer allocation.
>
> Move the direct kfree() from the error checking of dma_alloc_attrs() to
> the common fail path to ensure that allocations are released on all
> error paths in this function.
>
> > Addresses-Coverity: 1494120 ("Resource leak")
> >
> > Signed-off-by: Ameer Hamza <amhamza.mgc@gmail.com>
>
> Of course having suggested it, I believe this is the right fix so:
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Oh - and we should probably add a fixes tag:

Fixes: 40d87aafee29 ("media: venus: vdec: decoded picture buffer handling during reconfig sequence")

> > ---
> > Changes in v2:
> > move kfree() immediately after kfree() as suggested by Kieran Bingham
> > ---
> > drivers/media/platform/qcom/venus/helpers.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> > index 84c3a511ec31..0bca95d01650 100644
> > --- a/drivers/media/platform/qcom/venus/helpers.c
> > +++ b/drivers/media/platform/qcom/venus/helpers.c
> > @@ -189,7 +189,6 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
> > buf->va = dma_alloc_attrs(dev, buf->size, &buf->da, GFP_KERNEL,
> > buf->attrs);
> > if (!buf->va) {
> > - kfree(buf);
> > ret = -ENOMEM;
> > goto fail;
> > }
> > @@ -209,6 +208,7 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
> > return 0;
> >
> > fail:
> > + kfree(buf);
> > venus_helper_free_dpb_bufs(inst);
> > return ret;
> > }
> > --
> > 2.25.1
> >

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