[Freedreno] [PATCH] drm: msm: add null pointer check

[cgel . zte]

From: Lv Ruyi <lv.r...@zte.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 <zea...@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.r...@zte.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