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drm/msm/dpu: Add check for cstate

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[ Upstream commit c96988b7d9 ]

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: 1cff7440a8 ("drm/msm: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/514163/
Link: https://lore.kernel.org/r/20221206080517.43786-1-jiasheng@iscas.ac.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiasheng Jiang
2022-12-06 16:05:17 +08:00
committed by Greg Kroah-Hartman
parent 70bc4db1fb
commit 31f2f8de0e
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
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@@ -682,7 +682,10 @@ static void dpu_crtc_reset(struct drm_crtc *crtc)
if (crtc->state) if (crtc->state)
dpu_crtc_destroy_state(crtc, 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);
} }
/** /**