msm: camera: smmu: Avoid NULL dereference in cam_smmu_alloc_firmware

The iommu domain we grab from iommu_get_domain_for_dev can
be NULL. Eventually we will hit a NULL dereference in the
cam_smmu_alloc_firmware due to the missing check. Modify the
existing check to account for the possiblity of a NULL
domain and bail early.

CRs-Fixed: 2804766
Change-Id: I201260c3559b847cfb0bf7f85226816af148671d
Signed-off-by: Fernando Pacheco <[email protected]>

drivers/cam_smmu/cam_smmu_api.c

@@ -3552,7 +3552,7 @@ static int cam_smmu_setup_cb(struct cam_context_bank_info *cb,
 	/* create a virtual mapping */
 	if (cb->io_support) {
 		cb->domain = iommu_get_domain_for_dev(dev);
-		if (IS_ERR(cb->domain)) {
+		if (IS_ERR_OR_NULL(cb->domain)) {
 			CAM_ERR(CAM_SMMU, "Error: create domain Failed");
 			rc = -ENODEV;
 			goto end;