Fix use-after-free in osx_platform.cpp

Author: akalin

backend/src/osx_platform.cpp

@@ -39,7 +39,7 @@ bool OSXPlatform::run_privileged()
   OSStatus           err;
   AuthorizationFlags flags;
 
-  const char *path = this->path().c_str();
+  const string &path = this->path();
 
   flags = kAuthorizationFlagExtendRights | kAuthorizationFlagInteractionAllowed;
 
@@ -49,7 +49,7 @@ bool OSXPlatform::run_privileged()
 
   char *args[] = { (char *) "--fix-permissions", NULL };
 
-  err = AuthorizationExecuteWithPrivileges(auth, path, kAuthorizationFlagDefaults, args, NULL);
+  err = AuthorizationExecuteWithPrivileges(auth, path.c_str(), kAuthorizationFlagDefaults, args, NULL);
   AuthorizationFree(auth, kAuthorizationFlagDefaults);
   if (err == errAuthorizationCanceled)
     return false;