Safer set_environment().

Ensure that the return parameters are set safely when things go wrong.

diff --git a/registry.cpp b/registry.cpp
index 09ad1cb..74fe047 100644 (file)
--- a/registry.cpp
+++ b/registry.cpp
@@ -150,6 +150,7 @@ int set_environment(TCHAR *service_name, HKEY key, TCHAR *value, TCHAR **env, un
   /* Dummy test to find buffer size */\r
   unsigned long ret = RegQueryValueEx(key, value, 0, &type, NULL, envlen);\r
   if (ret != ERROR_SUCCESS) {\r
+    *env = 0;\r
     *envlen = 0;\r
     /* The service probably doesn't have any environment configured */\r
     if (ret == ERROR_FILE_NOT_FOUND) return 0;\r
@@ -158,6 +159,8 @@ int set_environment(TCHAR *service_name, HKEY key, TCHAR *value, TCHAR **env, un
   }\r
 \r
   if (type != REG_MULTI_SZ) {\r
+    *env = 0;\r
+    *envlen = 0;\r
     log_event(EVENTLOG_WARNING_TYPE, NSSM_EVENT_INVALID_ENVIRONMENT_STRING_TYPE, value, service_name, 0);\r
     return 2;\r
   }\r
@@ -170,6 +173,7 @@ int set_environment(TCHAR *service_name, HKEY key, TCHAR *value, TCHAR **env, un
 \r
   *env = (TCHAR *) HeapAlloc(GetProcessHeap(), 0, *envlen);\r
   if (! *env) {\r
+    *envlen = 0;\r
     log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, value, _T("set_environment()"), 0);\r
     return 3;\r
   }\r
@@ -177,10 +181,10 @@ int set_environment(TCHAR *service_name, HKEY key, TCHAR *value, TCHAR **env, un
   /* Actually get the strings */\r
   ret = RegQueryValueEx(key, value, 0, &type, (unsigned char *) *env, envlen);\r
   if (ret != ERROR_SUCCESS) {\r
-    log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_QUERYVALUE_FAILED, value, error_string(GetLastError()), 0);\r
     HeapFree(GetProcessHeap(), 0, *env);\r
     *env = 0;\r
     *envlen = 0;\r
+    log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_QUERYVALUE_FAILED, value, error_string(GetLastError()), 0);\r
     return 4;\r
   }\r
 \r