[PATCH] drm/msm: potential error pointer dereference in init()

[Dan Carpenter]

The msm_iommu_new() returns error pointers on failure so check for that
to avoid an Oops.

Fixes: ccac7ce373c1 ("drm/msm: Refactor address space initialization")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index ae48f41821cf..ad247c06e198 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -908,6 +908,10 @@ static int _dpu_kms_mmu_init(struct dpu_kms *dpu_kms)
                return 0;
 
        mmu = msm_iommu_new(dpu_kms->dev->dev, domain);
+       if (IS_ERR(mmu)) {
+               iommu_domain_free(domain);
+               return PTR_ERR(mmu);
+       }
        aspace = msm_gem_address_space_create(mmu, "dpu1",
                0x1000, 0x100000000 - 0x1000);
 
-- 
2.20.1