linux-kernel - [PATCH AUTOSEL 5.17 08/34] drm/msm/disp: check the return value of kzalloc()

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Date:   Tue, 19 Apr 2022 14:10:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiaoke Wang <xkernel.wang@...mail.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>, robdclark@...il.com,
        sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, greenfoo@....eu,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.17 08/34] drm/msm/disp: check the return value of kzalloc()

From: Xiaoke Wang <xkernel.wang@...mail.com>

[ Upstream commit f75e582b0c3ee8f0bddc2248cc8b9175f29c5937 ]

kzalloc() is a memory allocation function which can return NULL when
some internal memory errors happen. So it is better to check it to
prevent potential wrong memory access.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Link: https://lore.kernel.org/r/tencent_B3E19486FF39415098B572B7397C2936C309@qq.com
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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);
 
-- 
2.35.1