arch/powerpc/kvm/e500_tlb.c: fix error return code

Convert a 0 error return code to a negative one, as returned elsewhere in the
function.

A new label is also added to avoid freeing things that are known to not yet
be allocated.

A simplified version of the semantic match that finds the first problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret;
expression e,e1,e2,e3,e4,x;
@@

(
if (\(ret != 0\|ret < 0\) || ...) { ... return ...; }
|
ret = 0
)
... when != ret = e1
*x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...);
... when != x = e2
    when != ret = e3
*if (x == NULL || ...)
{
  ... when != ret = e4
*  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index 641f978..c733894 100644 (file)
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -1233,21 +1233,27 @@ int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
        }
 
        virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL);
-       if (!virt)
+       if (!virt) {
+               ret = -ENOMEM;
                goto err_put_page;
+       }
 
        privs[0] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[0],
                           GFP_KERNEL);
        privs[1] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[1],
                           GFP_KERNEL);
 
-       if (!privs[0] || !privs[1])
-               goto err_put_page;
+       if (!privs[0] || !privs[1]) {
+               ret = -ENOMEM;
+               goto err_privs;
+       }
 
        g2h_bitmap = kzalloc(sizeof(u64) * params.tlb_sizes[1],
                             GFP_KERNEL);
-       if (!g2h_bitmap)
-               goto err_put_page;
+       if (!g2h_bitmap) {
+               ret = -ENOMEM;
+               goto err_privs;
+       }
 
        free_gtlb(vcpu_e500);
 
@@ -1287,10 +1293,11 @@ int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
        kvmppc_recalc_tlb1map_range(vcpu_e500);
        return 0;
 
-err_put_page:
+err_privs:
        kfree(privs[0]);
        kfree(privs[1]);
 
+err_put_page:
        for (i = 0; i < num_pages; i++)
                put_page(pages[i]);