File: empty_block_last

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Description: Fix out-of-bound access when only last block is empty
Forwarded: https://savannah.nongnu.org/patch/index.php?10410
Author: Samuel Thibault <sthibault@debian.org>
Last-Update: 2023-11-18

--- a/src/core/ipv6/ip6_addr.c
+++ b/src/core/ipv6/ip6_addr.c
@@ -278,7 +278,7 @@
         }
         break;
       }
-      if (empty_block_flag == 0) {
+      if (empty_block_flag == 0 && current_block_index < 7) {
         /* generate empty block "::", but only if more than one contiguous zero block,
          * according to current formatting suggestions RFC 5952. */
         next_block_value = lwip_htonl(addr->addr[(current_block_index + 1) >> 1]);