From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 13 Jul 2017 10:38:29 +0300
Subject: KVM: PPC: e500: Fix some NULL dereferences on error
Patch-mainline: v4.14-rc1
Git-commit: 73e77c0982fd25ddb536339906412cbed78d0b79
References: bsc#1077761

There are some error paths in kvmppc_core_vcpu_create_e500() where we
forget to set the error code.  It means that we return ERR_PTR(0) which
is NULL and it results in a NULL pointer dereference in the caller.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Acked-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/e500.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/arch/powerpc/kvm/e500.c
+++ b/arch/powerpc/kvm/e500.c
@@ -455,16 +455,20 @@
 	if (err)
 		goto free_vcpu;
 
-	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL)
+	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) {
+		err = -ENOMEM;
 		goto uninit_vcpu;
+	}
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
 		goto uninit_id;
 
 	vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
-	if (!vcpu->arch.shared)
+	if (!vcpu->arch.shared) {
+		err = -ENOMEM;
 		goto uninit_tlb;
+	}
 
 	return vcpu;