<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11623#discussion_r325148017">sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c</a>:</p>
<pre style='color:#555'>> +            snd_buf->pkt = ptr->next;
+            ptr->next = NULL;
+        }
+        else {
+            ptr = gnrc_pktbuf_mark(snd_buf->pkt, remaining,
+                                   GNRC_NETTYPE_UNDEF);
+            if (ptr == NULL) {
+                DEBUG("ipv6_ext_frag: packet buffer full, canceling fragmentation\n");
+                gnrc_pktbuf_release(to_send);
+                _snd_buf_free(snd_buf);
+                return;
+            }
+            assert(snd_buf->pkt->next == ptr);  /* we just created it with mark */
+            snd_buf->pkt->next = snd_buf->pkt->next->next;
+            ptr->next = NULL;
+        }
</pre>
<p>Done</p>

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