drm/msm/dpu: Add check for pstates
[ Upstream commit 93340e10b9c5fc86730d149636e0aa8b47bb5a34 ]
As kzalloc may fail and return NULL pointer,
it should be better to check pstates
in order to avoid the NULL pointer dereference.
Fixes: 25fdd5933e
("drm/msm: Add SDM845 DPU support")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/514160/
Link: https://lore.kernel.org/r/20221206080236.43687-1-jiasheng@iscas.ac.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -836,6 +836,8 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
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}
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pstates = kzalloc(sizeof(*pstates) * DPU_STAGE_MAX * 4, GFP_KERNEL);
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if (!pstates)
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return -ENOMEM;
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dpu_crtc = to_dpu_crtc(crtc);
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cstate = to_dpu_crtc_state(state);
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