[PATCH] drm/mediatek: Initialize pointer before use to avoid undefiend behaviour

[Karan Sanghavi]

Initialize the pointer with NULL as mtk_drm_of_get_ddp_ep_cid
function might return before assigning value to next pointer
but yet further dereference to next can lead to some undefined
behavior as it may point to some invalid location.

Fixes: 4c932840db1d ("drm/mediatek: Implement OF graphs support for display paths")
Signed-off-by: Karan Sanghavi <karansanghvi98 at gmail.com>
---
Coverity Message:
CID 1601557: (#1 of 1): Uninitialized pointer read (UNINIT)
3. uninit_use: Using uninitialized value next.

Coverity Link:
https://scan7.scan.coverity.com/#/project-view/10043/11354?selectedIssue=1601557
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 9a8ef8558da9..bc06c664e80f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -900,7 +900,7 @@ static int mtk_drm_of_ddp_path_build_one(struct device *dev, enum mtk_crtc_path
 					 const unsigned int **out_path,
 					 unsigned int *out_path_len)
 {
-	struct device_node *next, *prev, *vdo = dev->parent->of_node;
+	struct device_node *next = NULL, *prev, *vdo = dev->parent->of_node;
 	unsigned int temp_path[DDP_COMPONENT_DRM_ID_MAX] = { 0 };
 	unsigned int *final_ddp_path;
 	unsigned short int idx = 0;

---
base-commit: 6d59cab07b8d74d0f0422b750038123334f6ecc2
change-id: 20241111-uninitializedpointer1601557-9803b725b6bd

Best regards,
-- 
Karan Sanghavi <karansanghvi98 at gmail.com>