libqos: Allow calling guest_free on NULL pointer

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tests/libqos/malloc.c b/tests/libqos/malloc.c
index 8276130..82b9df5 100644 (file)
--- a/tests/libqos/malloc.c
+++ b/tests/libqos/malloc.c
@@ -285,6 +285,9 @@ uint64_t guest_alloc(QGuestAllocator *allocator, size_t size)
 
 void guest_free(QGuestAllocator *allocator, uint64_t addr)
 {
+    if (!addr) {
+        return;
+    }
     mlist_free(allocator, addr);
     if (allocator->opts & ALLOC_PARANOID) {
         mlist_check(allocator);