iommu/amd: Fix possible memory leak of 'domain'

Move allocation code down to avoid memory leak.

Fixes: 29f54745f245 ("iommu/amd: Add missing domain type checks")
Signed-off-by: Su Hui <suhui@nfschina.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20230608021933.856045-1-suhui@nfschina.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index dc1ec68..e8a2e59 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2078,10 +2078,6 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
        int mode = DEFAULT_PGTABLE_LEVEL;
        int ret;
 
-       domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-       if (!domain)
-               return NULL;
-
        /*
         * Force IOMMU v1 page table when iommu=pt and
         * when allocating domain for pass-through devices.
@@ -2097,6 +2093,10 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
                return NULL;
        }
 
+       domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+       if (!domain)
+               return NULL;
+
        switch (pgtable) {
        case AMD_IOMMU_V1:
                ret = protection_domain_init_v1(domain, mode);