Re: [PATCH] drm/msm: Fix potential Oops in a6xx_gmu_rpmh_init()

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On 04/10/2021 16:45, Dan Carpenter wrote:
There are two problems here:
1) The "seqptr" is used uninitalized when we free it at the end.

This looks like a nice catch, potentially causing troubles.

2) The a6xx_gmu_get_mmio() function returns error pointers.  It never
    returns true.

Fixes: 64245fc55172 ("drm/msm/a6xx: use AOP-initialized PDC for a650")
Fixes: f8fc924e088e ("drm/msm/a6xx: Fix PDC register overlap")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index a7c58018959f..3bd6e579ea89 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -512,11 +512,11 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
  	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
  	struct platform_device *pdev = to_platform_device(gmu->dev);
  	void __iomem *pdcptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc");
-	void __iomem *seqptr;
+	void __iomem *seqptr = NULL;
  	uint32_t pdc_address_offset;
  	bool pdc_in_aop = false;
- if (!pdcptr)
+	if (IS_ERR(pdcptr))
  		goto err;
if (adreno_is_a650(adreno_gpu) || adreno_is_a660_family(adreno_gpu))
@@ -528,7 +528,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
if (!pdc_in_aop) {
  		seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
-		if (!seqptr)
+		if (IS_ERR(seqptr))
  			goto err;
  	}


--
With best wishes
Dmitry



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