linux-kernel - [PATCH] drm/msm/hdmi: Add missing check for alloc_ordered

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Message-Id: <20230106023011.3985-1-jiasheng@iscas.ac.cn>
Date:   Fri,  6 Jan 2023 10:30:11 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     robdclark@...il.com, quic_abhinavk@...cinc.com,
        dmitry.baryshkov@...aro.org, sean@...rly.run, airlied@...il.com,
        daniel@...ll.ch, swboyd@...omium.org, quic_khsieh@...cinc.com,
        johan+linaro@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] drm/msm/hdmi: Add missing check for alloc_ordered_workqueue

Add check for the return value of alloc_ordered_workqueue as it may return
NULL pointer and cause NULL pointer dereference in `hdmi_hdcp.c` and
`hdmi_hpd.c`.

Fixes: c6a57a50ad56 ("drm/msm/hdmi: add hdmi hdcp support (V3)")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/gpu/drm/msm/hdmi/hdmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 4d3fdc806bef..8e801ec0b33f 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -120,6 +120,10 @@ static int msm_hdmi_init(struct hdmi *hdmi)
 	int ret;
 
 	hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
+	if (!hdmi->workq) {
+		ret = -ENOMEM;
+		goto fail;
+	}
 
 	hdmi->i2c = msm_hdmi_i2c_init(hdmi);
 	if (IS_ERR(hdmi->i2c)) {
-- 
2.25.1