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Verify min MTU for IPv6 packet too big

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Bug #68610, Reported by Daniel Birtwhistle
This commit is contained in:
Erik Ekman
2026-09-01 13:26:18 +02:00
parent f89407ea71
commit d08f4773ed
1 changed files with 7 additions and 2 deletions
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9
src/core/ipv6/nd6.c
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@@ -947,9 +947,14 @@ nd6_input(struct pbuf *p, struct netif *inp)
return;
}
pmtu = lwip_htonl(icmp6hdr->data) & 0xFFFF;
if (pmtu < IP6_MIN_MTU_LENGTH) {
/* MTU too small */
pbuf_free(p);
return;
}
/* Change the Path MTU. */
pmtu = lwip_htonl(icmp6hdr->data);
destination_cache[dest_idx].pmtu = (u16_t)LWIP_MIN(pmtu, 0xFFFF);
destination_cache[dest_idx].pmtu = (u16_t)pmtu;
break; /* ICMP6_TYPE_PTB */
}