vendor/libsodium/src/libsodium/sodium/utils.c in rbnacl-libsodium-1.0.5 vs vendor/libsodium/src/libsodium/sodium/utils.c in rbnacl-libsodium-1.0.6

@@ -143,11 +143,13 @@
     size_t        i;
 
 #if HAVE_WEAK_SYMBOLS
     _sodium_dummy_symbol_to_prevent_compare_lto(b1, b2, len);
 #endif
-    for (i = (size_t) 0U; i < len; i++) {
+    i = len;
+    while (i != 0U) {
+        i--;
         gt |= ((b2[i] - b1[i]) >> 8) & eq;
         eq &= ((b2[i] ^ b1[i]) - 1) >> 8;
     }
     return (int) (gt + gt + eq) - 1;
 }
@@ -389,10 +391,10 @@
 #  error Bug
 # endif
 }
 
 static unsigned char *
-_unprotected_ptr_from_user_ptr(const void *ptr)
+_unprotected_ptr_from_user_ptr(void * const ptr)
 {
     uintptr_t      unprotected_ptr_u;
     unsigned char *canary_ptr;
     size_t         page_mask;