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gnrc/icmpv6: add check for too big icmpv6 packets

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This commit is contained in:
krzysztof-cabaj 2023-09-13 14:31:35 -04:00
parent ec69cfde6f
commit d7000477d4
1 changed files with 6 additions and 0 deletions
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6
sys/net/gnrc/network_layer/icmpv6/echo/gnrc_icmpv6_echo.c
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@ -150,6 +150,12 @@ int gnrc_icmpv6_echo_send(const gnrc_netif_t *netif, const ipv6_addr_t *addr,
ipv6_hdr_t *ipv6;
uint8_t *databuf;
/* max IPv6 payload 65535 minus 8 bytes of icmp header = 65527 */
if (len > (UINT16_MAX - sizeof(icmpv6_hdr_t))) {
DEBUG("error: wrong icmpv6 packet length\n");
return -EINVAL;
}
pkt = gnrc_icmpv6_echo_build(ICMPV6_ECHO_REQ, id, seq, NULL, len);
if (pkt == NULL) {
DEBUG("error: packet buffer full\n");