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fixed bug #40177 (System hangs when dealing with corrupted packets), implemented task #12357 (Ensure that malicious packets don't assert-fail): improved some pbuf_header calls to not assert-fail.

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This commit is contained in:
sg 2015-02-25 22:58:27 +01:00
parent c8d126f6ef
commit 5984c996a8
3 changed files with 12 additions and 6 deletions
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5
CHANGELOG
View File

@ -202,6 +202,11 @@ HISTORY
++ Bugfixes:
2015-02-25: Simon Goldschmidt
* ip4.c, etharp.c: fixed bug #40177 (System hangs when dealing with corrupted
packets), implemented task #12357 (Ensure that malicious packets don't
assert-fail): improved some pbuf_header calls to not assert-fail.
2015-02-25: patch by Joel Cunningham
* udp.h/.c, sockets.c: fixed bug #43028 (IP_MULTICAST_TTL affects unicast
datagrams)

9
src/core/ipv4/ip4.c
View File

@ -352,6 +352,11 @@ ip_input(struct pbuf *p, struct netif *inp)
/* obtain ip length in bytes */
iphdr_len = ntohs(IPH_LEN(iphdr));
/* Trim pbuf. This is especially required for packets < 60 bytes. */
if (iphdr_len < p->tot_len) {
pbuf_realloc(p, iphdr_len);
}
/* 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) {
@ -387,10 +392,6 @@ ip_input(struct pbuf *p, struct netif *inp)
}
#endif
/* Trim pbuf. This should have been done at the netif layer,
* but we'll do it anyway just to be sure that its done. */
pbuf_realloc(p, iphdr_len);
/* copy IP addresses to aligned ip_addr_t */
ip_addr_copy(*ipX_2_ip(&ip_data.current_iphdr_dest), iphdr->dest);
ip_addr_copy(*ipX_2_ip(&ip_data.current_iphdr_src), iphdr->src);

4
src/netif/etharp.c
View File

@ -1427,7 +1427,7 @@ ethernet_input(struct pbuf *p, struct netif *netif)
etharp_ip_input(netif, p);
#endif /* ETHARP_TRUST_IP_MAC */
/* skip Ethernet header */
if (pbuf_header(p, (s16_t)-ip_hdr_offset)) {
if ((p->len < ip_hdr_offset) || pbuf_header(p, (s16_t)-ip_hdr_offset)) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
("ethernet_input: IPv4 packet dropped, too short (%"S16_F"/%"S16_F")\n",
p->tot_len, ip_hdr_offset));
@ -1460,7 +1460,7 @@ ethernet_input(struct pbuf *p, struct netif *netif)
#if LWIP_IPV6
case PP_HTONS(ETHTYPE_IPV6): /* IPv6 */
/* skip Ethernet header */
if(pbuf_header(p, (s16_t)-ip_hdr_offset)) {
if((p->len < ip_hdr_offset) || pbuf_header(p, (s16_t)-ip_hdr_offset)) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
("ethernet_input: IPv6 packet dropped, too short (%"S16_F"/%"S16_F")\n",
p->tot_len, ip_hdr_offset));