[PATCH 5/9] drm/nouveau/bios/power_budget: Move an expression into a macro call parameter in nvbios_power_budget_header()

[Markus Elfring]

Date: Sat, 15 Apr 2023 22:30:30 +0200

The address of a data structure member was determined before
a corresponding null pointer check in the implementation of
the function “nvbios_power_budget_header”.

Thus avoid the risk for undefined behaviour by moving the usage
of an expression into a parameter for a macro call in one if branch.

This issue was detected by using the Coccinelle software.

Fixes: e5f8eabc0077ea3f77b3362e28d3969ae62e70f0 ("drm/nouveau/bios/power_budget: Add basic power budget parsing")
Signed-off-by: Markus Elfring <elfring at users.sourceforge.net>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
index 03d2f970a29f..2ba992bdb19d 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
@@ -59,7 +59,6 @@ int
 nvbios_power_budget_header(struct nvkm_bios *bios,
                            struct nvbios_power_budget *budget)
 {
-	struct nvkm_subdev *subdev = &bios->subdev;
 	u8 ver, hdr, cnt, len, cap_entry;
 	u32 header;

@@ -82,7 +81,7 @@ nvbios_power_budget_header(struct nvkm_bios *bios,
 	}

 	if (cap_entry >= cnt && cap_entry != 0xff) {
-		nvkm_warn(subdev,
+		nvkm_warn(&bios->subdev,
 		          "invalid cap_entry in power budget table found\n");
 		budget->cap_entry = 0xff;
 		return -EINVAL;
--
2.40.0