[next] drm/msm/a5xx: Fix a NULL dereference bug in a5xx_gpu_init()

Commit Message

Harshit Mogalapalli June 27, 2023, 4:12 a.m. UTC

Smatch complains:
	drivers/gpu/drm/msm/adreno/a5xx_gpu.c:1753
	a5xx_gpu_init() warn: variable dereferenced before
	check 'pdev' (see line 1746)

When no device is defined, dereferencing pdev is a NULL dereference.
Fix this by dereferencing pdev to get the config post the NULL check.

Fixes: 736a93273656 ("drm/msm/a5xx: really check for A510 in a5xx_gpu_init")
Signed-off-by: Harshit Mogalapalli <[e-mail]>
---
This is based on static analysis, only compile tested.
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index a99310b68793..adaf8f8e7f2d 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1743,7 +1743,7 @@  struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct platform_device *pdev = priv->gpu_pdev;
-	struct adreno_platform_config *config = pdev->dev.platform_data;
+	struct adreno_platform_config *config;
 	struct a5xx_gpu *a5xx_gpu = NULL;
 	struct adreno_gpu *adreno_gpu;
 	struct msm_gpu *gpu;
@@ -1755,6 +1755,8 @@  struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 		return ERR_PTR(-ENXIO);
 	}
 
+	config = pdev->dev.platform_data;
+
 	a5xx_gpu = kzalloc(sizeof(*a5xx_gpu), GFP_KERNEL);
 	if (!a5xx_gpu)
 		return ERR_PTR(-ENOMEM);