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drm/msm/hdmi: check return value after calling platform_get_resource_byname()

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[ Upstream commit a36e506711548df923ceb7ec9f6001375be799a5 ]

It will cause null-ptr-deref if platform_get_resource_byname() returns NULL,
we need check the return value.

Fixes: c6a57a50ad ("drm/msm/hdmi: add hdmi hdcp support (V3)")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/482992/
Link: https://lore.kernel.org/r/20220422032227.2991553-1-yangyingliang@huawei.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang
2022-04-22 11:22:27 +08:00
committed by Greg Kroah-Hartman
parent e99755e6a9
commit d9cb951d11
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/msm/hdmi/hdmi.c
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@@ -142,6 +142,10 @@ static struct hdmi *msm_hdmi_init(struct platform_device *pdev)
/* HDCP needs physical address of hdmi register */ /* HDCP needs physical address of hdmi register */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
config->mmio_name); config->mmio_name);
if (!res) {
ret = -EINVAL;
goto fail;
}
hdmi->mmio_phy_addr = res->start; hdmi->mmio_phy_addr = res->start;
hdmi->qfprom_mmio = msm_ioremap(pdev, hdmi->qfprom_mmio = msm_ioremap(pdev,