Add test case for issue #266 ("Invalid read of size 4" in cpu_tb_exec).

tests/regress/invalid_read_in_cpu_tb_exec.c

@@ -0,0 +1,28 @@
+#include <unicorn/unicorn.h>
+
+static void hook_block(uc_engine *uc, uint64_t address, uint32_t size, void *user_data) {
+  printf("hook_block(…)\n");
+}
+
+#define BINARY "\x80\x05\xff\xff\xff\xff\x30\xeb\xf7\x30"
+#define MEMORY_SIZE 2 * 1024 * 1024
+#define STARTING_ADDRESS 0x1000000
+
+int main(int argc, char **argv, char **envp) {
+  uc_engine *uc;
+  if (uc_open(UC_ARCH_X86, UC_MODE_64, &uc)) {
+    printf("uc_open(…) failed\n");
+    return 1;
+  }
+  uc_mem_map(uc, STARTING_ADDRESS, MEMORY_SIZE, UC_PROT_ALL);
+  if (uc_mem_write(uc, STARTING_ADDRESS, BINARY, sizeof(BINARY) - 1)) {
+    printf("uc_mem_write(…) failed\n");
+    return 1;
+  }
+  uc_hook hook;
+  uc_hook_add(uc, &hook, UC_HOOK_BLOCK, hook_block, NULL, 1, 0);
+  printf("uc_emu_start(…)\n");
+  uc_emu_start(uc, STARTING_ADDRESS, STARTING_ADDRESS + sizeof(BINARY) - 1, 0, 0);
+  printf("done\n");
+  return 0;
+}