re: iommu/amd: Implement dm_region call-backs

[Dan Carpenter]

Hello Joerg Roedel,

The patch b61238c4a5e1: "iommu/amd: Implement dm_region call-backs"
from May 28, 2015, leads to the following static checker warning:

        drivers/iommu/amd_iommu.c:3153 amd_iommu_get_dm_regions()
        error: potential null dereference 'region'.  (kzalloc returns null)

drivers/iommu/amd_iommu.c
  3138  static void amd_iommu_get_dm_regions(struct device *dev,
  3139                                       struct list_head *head)
  3140  {
  3141          struct unity_map_entry *entry;
  3142          u16 devid;
  3143  
  3144          devid = get_device_id(dev);
  3145  
  3146          list_for_each_entry(entry, &amd_iommu_unity_map, list) {
  3147                  struct iommu_dm_region *region;
  3148  
  3149                  if (devid < entry->devid_start || devid > 
entry->devid_end)
  3150                          continue;
  3151  
  3152                  region = kzalloc(sizeof(*region), GFP_KERNEL);

No check here.  We may not care and in that case just ignore this
email.  Or add GFP_NOFAIL to silence the warning if you want.

  3153                  region->start = entry->address_start;
  3154                  region->length = entry->address_end - 
entry->address_start;
  3155                  if (entry->prot & IOMMU_PROT_IR)
  3156                          region->prot |= IOMMU_READ;
  3157                  if (entry->prot & IOMMU_PROT_IW)
  3158                          region->prot |= IOMMU_WRITE;
  3159  
  3160                  list_add_tail(&region->list, head);
  3161          }
  3162  }

regards,
dan carpenter
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