fixed error handling in os.exec() (#503)

diff --git a/quickjs-libc.c b/quickjs-libc.c
index 99ba96fc5d58de52cbc0942ca6697f74303a0fd9..84f990d94ac4f9fb4146eef01264813d19030c8e 100644 (file)
--- a/quickjs-libc.c
+++ b/quickjs-libc.c
@@ -3309,7 +3309,7 @@ static JSValue js_os_exec(JSContext *ctx, JSValueConst this_val,
     for(i = 0; i < exec_argc; i++)
         JS_FreeCString(ctx, exec_argv[i]);
     js_free(ctx, exec_argv);
-    if (envp != environ) {
+    if (envp && envp != environ) {
         char **p;
         p = envp;
         while (*p != NULL) {