linux-kernel - [PATCH AUTOSEL 4.14 2/9] drm/msm/dsi: Add missing check for alloc_ordered

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Message-Id: <20230227021131.1053662-2-sashal@kernel.org>
Date:   Sun, 26 Feb 2023 21:11:24 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sasha Levin <sashal@...nel.org>, robdclark@...il.com,
        airlied@...il.com, daniel@...ll.ch, marijn.suijten@...ainline.org,
        vkoul@...nel.org, dianders@...omium.org, vladimir.lypak@...il.com,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.14 2/9] drm/msm/dsi: Add missing check for alloc_ordered_workqueue

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit 115906ca7b535afb1fe7b5406c566ccd3873f82b ]

Add check for the return value of alloc_ordered_workqueue as it may return
NULL pointer and cause NULL pointer dereference.

Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/517646/
Link: https://lore.kernel.org/r/20230110021651.12770-1-jiasheng@iscas.ac.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index c9c8d21905159..43a3a48a15df5 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1769,6 +1769,9 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 
 	/* setup workqueue */
 	msm_host->workqueue = alloc_ordered_workqueue("dsi_drm_work", 0);
+	if (!msm_host->workqueue)
+		return -ENOMEM;
+
 	INIT_WORK(&msm_host->err_work, dsi_err_worker);
 	INIT_WORK(&msm_host->hpd_work, dsi_hpd_worker);
 
-- 
2.39.0