KVM: s390: avoid memory leaks if __inject_vm() fails

We have to delete the allocated interrupt info if __inject_vm() fails.

Otherwise user space can keep flooding kvm with floating interrupts and
provoke more and more memory leaks.

Reported-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index a6cb238049d1..6d7513e15560 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1277,6 +1277,7 @@ int kvm_s390_inject_vm(struct kvm *kvm,
                        struct kvm_s390_interrupt *s390int)
 {
         struct kvm_s390_interrupt_info *inti;
+        int rc;
 
         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
         if (!inti)
@@ -1324,7 +1325,10 @@ int kvm_s390_inject_vm(struct kvm *kvm,
         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
                                  2);
 
-        return __inject_vm(kvm, inti);
+        rc = __inject_vm(kvm, inti);
+        if (rc)
+                kfree(inti);
+        return rc;
 }
 
 void kvm_s390_reinject_io_int(struct kvm *kvm,