linux-kernel - Re: [PATCH] drm: nouveau: fix nvbe leakage

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Date:	Mon, 7 Oct 2013 21:34:20 -0400 (EDT)
From:	Ben Skeggs <bskeggs@...hat.com>
To:	Geyslan Gregório Bem <geyslan@...il.com>
Cc:	Felipe Pena <felipensp@...il.com>, airlied@...ux.ie,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-br <kernel-br@...glegroups.com>
Subject: Re: [PATCH] drm: nouveau: fix nvbe leakage

----- Original Message -----
> From: "Geyslan Gregório Bem" <geyslan@...il.com>
> To: "Felipe Pena" <felipensp@...il.com>
> Cc: "Ben Skeggs" <bskeggs@...hat.com>, airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
> linux-kernel@...r.kernel.org, "kernel-br" <kernel-br@...glegroups.com>
> Sent: Tuesday, 8 October, 2013 9:39:02 AM
> Subject: Re: [PATCH] drm: nouveau: fix nvbe leakage
> 
> Felipe, thank you too.
> 
> I realized this after a code review.
> 
> Ben, what do you think?
> 
> Geyslan Gregório Bem
> hackingbits.com
> 
> 
> 2013/10/7 Felipe Pena <felipensp@...il.com>:
> > Hi,
> >
> > On Mon, Oct 7, 2013 at 7:35 PM, Ben Skeggs <bskeggs@...hat.com> wrote:
> >> ----- Original Message -----
> >>> From: "Geyslan G. Bem" <geyslan@...il.com>
> >>> To: airlied@...ux.ie, bskeggs@...hat.com, dri-devel@...ts.freedesktop.org
> >>> Cc: linux-kernel@...r.kernel.org, kernel-br@...glegroups.com, "Geyslan G.
> >>> Bem" <geyslan@...il.com>
> >>> Sent: Tuesday, 8 October, 2013 8:14:26 AM
> >>> Subject: [PATCH] drm: nouveau: fix nvbe leakage
> >>>
> >>> Free memory allocated to nvbe when returning NULL.
> >>>
> >>> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
> >> NACK.  ttm_dma_tt_init() calls the destructor if it fails, which frees the
> >> memory.
> >>
> >> Ben.
> >>
> >
> > But ttm_tt_destroy() just handles the ttm_tt part from nvbe, the nvbe
> > pointer itself is not being free'd.
Actually look at ttm_tt_destroy() and you'll see that right at the end it goes ttm->func->destroy(ttm), which is nouveau_sgdma_destroy().

Ben.
> >
> >>> ---
> >>>  drivers/gpu/drm/nouveau/nouveau_sgdma.c | 3 +++
> >>>  1 file changed, 3 insertions(+)
> >>>
> >>> diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> >>> b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> >>> index 0843ebc..af8b66d 100644
> >>> --- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> >>> +++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> >>> @@ -105,6 +105,9 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
> >>>               nvbe->ttm.ttm.func = &nv50_sgdma_backend;
> >>>
> >>>       if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags,
> >>>       dummy_read_page))
> >>> +     {
> >>> +             kfree(nvbe);
> >>>               return NULL;
> >>> +     }
> >>>       return &nvbe->ttm.ttm;
> >>>  }
> >>> --
> >>> 1.8.4
> >>>
> >>>
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> >> the body of a message to majordomo@...r.kernel.org
> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >> Please read the FAQ at  http://www.tux.org/lkml/
> >
> >
> >
> > --
> > Regards,
> > Felipe Pena
> 
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