Merge pull request #242 from practicalswift/segfault-on-stop

Fix segfault on emu_stop()

tests/regress/segfault_on_stop.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+
+import regress
+import unicorn
+
+
+class SegfaultOnStop(regress.RegressTest):
+    def test(self):
+        unicorn.Uc(unicorn.UC_ARCH_X86, unicorn.UC_MODE_64).emu_stop()
+        self.assertTrue(True, "If not reached, then we have a crashing bug.")
+
+if __name__ == '__main__':
+    regress.main()

uc.c

@@ -525,8 +525,10 @@ uc_err uc_emu_stop(uc_engine *uc)
         return UC_ERR_OK;
 
     uc->stop_request = true;
-    // exit the current TB
-    cpu_exit(uc->current_cpu);
+    if (uc->current_cpu) {
+        // exit the current TB
+        cpu_exit(uc->current_cpu);
+    }
 
     return UC_ERR_OK;
 }