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Message-Id: <20221206080517.43786-1-jiasheng@iscas.ac.cn>
Date: Tue, 6 Dec 2022 16:05:17 +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, quic_jesszhan@...cinc.com,
ville.syrjala@...ux.intel.com, yang.lee@...ux.alibaba.com
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/dpu: Add check for cstate
As kzalloc may fail and return NULL pointer,
it should be better to check cstate
in order to avoid the NULL pointer dereference
in __drm_atomic_helper_crtc_reset.
Fixes: 1cff7440a86e ("drm/msm: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 13ce321283ff..22c2787b7b38 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -968,7 +968,10 @@ static void dpu_crtc_reset(struct drm_crtc *crtc)
if (crtc->state)
dpu_crtc_destroy_state(crtc, crtc->state);
- __drm_atomic_helper_crtc_reset(crtc, &cstate->base);
+ if (cstate)
+ __drm_atomic_helper_crtc_reset(crtc, &cstate->base);
+ else
+ __drm_atomic_helper_crtc_reset(crtc, NULL);
}
/**
--
2.25.1
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