Diff of /sem_post.c [1beb00] .. [9e61bc]  Maximize  Restore

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--- a/sem_post.c
+++ b/sem_post.c
@@ -82,6 +82,15 @@
     }
   else if ((result = pthread_mutex_lock (&s->lock)) == 0)
     {
+      /* See sem_destroy.c
+       */
+      if (*sem == NULL)
+        {
+          (void) pthread_mutex_unlock (&s->lock);
+          result = EINVAL;
+          return -1;
+        }
+
       if (s->value < SEM_VALUE_MAX)
 	{
 #ifdef NEED_SEM