linux-kernel - [PATCH] drm: msm: add null pointer check

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Date:   Tue, 29 Mar 2022 10:34:16 +0000
From:   cgel.zte@...il.com
To:     robdclark@...il.com
Cc:     sean@...rly.run, quic_abhinavk@...cinc.com, airlied@...ux.ie,
        daniel@...ll.ch, dmitry.baryshkov@...aro.org,
        bjorn.andersson@...aro.org, lv.ruyi@....com.cn, greenfoo@....eu,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drm: msm: add null pointer check

From: Lv Ruyi <lv.ruyi@....com.cn>

kzalloc is a memory allocation function which can return NULL when some
internal memory errors happen. Add null pointer check to avoid
dereferencing null pointer.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
index 5d2ff6791058..acfe1b31e079 100644
--- a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
+++ b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c
@@ -176,6 +176,8 @@ void msm_disp_snapshot_add_block(struct msm_disp_state *disp_state, u32 len,
 	va_list va;
 
 	new_blk = kzalloc(sizeof(struct msm_disp_state_block), GFP_KERNEL);
+	if (!new_blk)
+		return;
 
 	va_start(va, fmt);
 
-- 
2.25.1