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Check for minimum IPv4 header length in rx packets

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This commit is contained in:
goldsimon 2016-06-17 09:36:14 +02:00
parent fda778f6b6
commit 61e067b98a
2 changed files with 9 additions and 1 deletions
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4
src/core/ipv4/icmp.c
View File

@ -89,6 +89,10 @@ icmp_input(struct pbuf *p, struct netif *inp)
iphdr_in = ip4_current_header();
hlen = IPH_HL(iphdr_in) * 4;
if (hlen < IP_HLEN) {
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short IP header (%"S16_F" bytes) received\n", hlen));
goto lenerr;
}
if (p->len < sizeof(u16_t)*2) {
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
goto lenerr;

6
src/core/ipv4/ip4.c
View File

@ -410,7 +410,11 @@ ip4_input(struct pbuf *p, struct netif *inp)
}
/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len) || (iphdr_hlen < IP_HLEN)) {
if (iphdr_hlen < IP_HLEN) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("ip4_input: short IP header (%"U16_F" bytes) received, IP packet dropped\n", iphdr_hlen));
}
if (iphdr_hlen > p->len) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",