[PATCH] kvm:powerpc:Fix error handling in the function mpic_set_default_irq_routing

[Nicholas Krause <xerofoify@gmail.com>]

This fixes error handling in the function mpic_set_default_irq_routing
by checking if the call to the function kvm_set_irq_routing has failed
and if so exit immediately to the caller by first freeing the structure
pointer routing in order to avoid a memory leak before returning the error
code returned by the call to mpic_set_default_irq_routing.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
---
 arch/powerpc/kvm/mpic.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/mpic.c b/arch/powerpc/kvm/mpic.c
index 6249cdc..7b1375a 100644
--- a/arch/powerpc/kvm/mpic.c
+++ b/arch/powerpc/kvm/mpic.c
@@ -1641,13 +1641,18 @@ static void mpic_destroy(struct kvm_device *dev)
 static int mpic_set_default_irq_routing(struct openpic *opp)
 {
 	struct kvm_irq_routing_entry *routing;
+	int ret;
 
 	/* Create a nop default map, so that dereferencing it still works */
 	routing = kzalloc((sizeof(*routing)), GFP_KERNEL);
 	if (!routing)
 		return -ENOMEM;
 
-	kvm_set_irq_routing(opp->kvm, routing, 0, 0);
+	ret = kvm_set_irq_routing(opp->kvm, routing, 0, 0);
+	if (ret) {
+		kfree(routing);
+		return ret;
+	}
 
 	kfree(routing);
 	return 0;
-- 
2.1.4