From: Hyungwon Hwang <human.hwang@samsung.com>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>,
linux-samsung-soc@vger.kernel.org,
dri-devel@lists.freedesktop.org,
Andrzej Hajda <a.hajda@samsung.com>,
Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Subject: Re: [PATCH] drm/exynos: iommu: fix potential NULL pointer dereference
Date: Mon, 29 Jun 2015 15:35:44 +0900 [thread overview]
Message-ID: <20150629153544.79046d24@hwh-ubuntu> (raw)
In-Reply-To: <1435237812-24959-1-git-send-email-m.szyprowski@samsung.com>
Dear Marek,
On Thu, 25 Jun 2015 15:10:12 +0200
Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> Some drivers (like Exynos mixer) calls
> drm_iommu_attach_device_if_possible before registering crtc, so
> additional check for NULL crtc pointer is required.
It seems reasonable.
Reviewed-by: Hyungwon Hwang <human.hwang@samsung.com>
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> drivers/gpu/drm/exynos/exynos_drm_iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
> b/drivers/gpu/drm/exynos/exynos_drm_iommu.c index
> d4ec7465e9cc..d4eb730ba254 100644 ---
> a/drivers/gpu/drm/exynos/exynos_drm_iommu.c +++
> b/drivers/gpu/drm/exynos/exynos_drm_iommu.c @@ -151,7 +151,7 @@ int
> drm_iommu_attach_device_if_possible(struct exynos_drm_crtc
> *exynos_crtc, int ret = 0;
> if (is_drm_iommu_supported(drm_dev)) {
> - if (exynos_crtc->ops->clear_channels)
> + if (exynos_crtc && exynos_crtc->ops->clear_channels)
> exynos_crtc->ops->clear_channels(exynos_crtc);
> return drm_iommu_attach_device(drm_dev, subdrv_dev);
> }
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next prev parent reply other threads:[~2015-06-29 6:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-25 13:10 [PATCH] drm/exynos: iommu: fix potential NULL pointer dereference Marek Szyprowski
2015-06-29 6:35 ` Hyungwon Hwang [this message]
2015-07-02 12:46 ` Joonyoung Shim
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