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Diffstat (limited to 'net/ipv4/icmp.c')
-rw-r--r--net/ipv4/icmp.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 8b30cadff708..b7e277d8a84d 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -1054,14 +1054,19 @@ bool icmp_build_probe(struct sk_buff *skb, struct icmphdr *icmphdr)
iio = skb_header_pointer(skb, sizeof(_ext_hdr), sizeof(iio->extobj_hdr), &_iio);
if (!ext_hdr || !iio)
goto send_mal_query;
- if (ntohs(iio->extobj_hdr.length) <= sizeof(iio->extobj_hdr))
+ if (ntohs(iio->extobj_hdr.length) <= sizeof(iio->extobj_hdr) ||
+ ntohs(iio->extobj_hdr.length) > sizeof(_iio))
goto send_mal_query;
ident_len = ntohs(iio->extobj_hdr.length) - sizeof(iio->extobj_hdr);
+ iio = skb_header_pointer(skb, sizeof(_ext_hdr),
+ sizeof(iio->extobj_hdr) + ident_len, &_iio);
+ if (!iio)
+ goto send_mal_query;
+
status = 0;
dev = NULL;
switch (iio->extobj_hdr.class_type) {
case ICMP_EXT_ECHO_CTYPE_NAME:
- iio = skb_header_pointer(skb, sizeof(_ext_hdr), sizeof(_iio), &_iio);
if (ident_len >= IFNAMSIZ)
goto send_mal_query;
memset(buff, 0, sizeof(buff));
@@ -1069,30 +1074,24 @@ bool icmp_build_probe(struct sk_buff *skb, struct icmphdr *icmphdr)
dev = dev_get_by_name(net, buff);
break;
case ICMP_EXT_ECHO_CTYPE_INDEX:
- iio = skb_header_pointer(skb, sizeof(_ext_hdr), sizeof(iio->extobj_hdr) +
- sizeof(iio->ident.ifindex), &_iio);
if (ident_len != sizeof(iio->ident.ifindex))
goto send_mal_query;
dev = dev_get_by_index(net, ntohl(iio->ident.ifindex));
break;
case ICMP_EXT_ECHO_CTYPE_ADDR:
- if (ident_len != sizeof(iio->ident.addr.ctype3_hdr) +
+ if (ident_len < sizeof(iio->ident.addr.ctype3_hdr) ||
+ ident_len != sizeof(iio->ident.addr.ctype3_hdr) +
iio->ident.addr.ctype3_hdr.addrlen)
goto send_mal_query;
switch (ntohs(iio->ident.addr.ctype3_hdr.afi)) {
case ICMP_AFI_IP:
- iio = skb_header_pointer(skb, sizeof(_ext_hdr), sizeof(iio->extobj_hdr) +
- sizeof(struct in_addr), &_iio);
- if (ident_len != sizeof(iio->ident.addr.ctype3_hdr) +
- sizeof(struct in_addr))
+ if (iio->ident.addr.ctype3_hdr.addrlen != sizeof(struct in_addr))
goto send_mal_query;
dev = ip_dev_find(net, iio->ident.addr.ip_addr.ipv4_addr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case ICMP_AFI_IP6:
- iio = skb_header_pointer(skb, sizeof(_ext_hdr), sizeof(_iio), &_iio);
- if (ident_len != sizeof(iio->ident.addr.ctype3_hdr) +
- sizeof(struct in6_addr))
+ if (iio->ident.addr.ctype3_hdr.addrlen != sizeof(struct in6_addr))
goto send_mal_query;
dev = ipv6_stub->ipv6_dev_find(net, &iio->ident.addr.ip_addr.ipv6_addr, dev);
dev_hold(dev);