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-rw-r--r--net/ipv6/ip6_offload.c2
-rw-r--r--net/ipv6/ip6_output.c4
-rw-r--r--net/ipv6/output_core.c14
-rw-r--r--net/ipv6/udp_offload.c2
4 files changed, 16 insertions, 6 deletions
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 93e58a5e1837..eab36abc9f22 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -117,6 +117,8 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
if (udpfrag) {
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
+ if (unfrag_ip6hlen < 0)
+ return ERR_PTR(unfrag_ip6hlen);
fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
fptr->frag_off = htons(offset);
if (skb->next)
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 58f6288e9ba5..01deecda2f84 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -598,6 +598,10 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
u8 *prevhdr, nexthdr = 0;
hlen = ip6_find_1stfragopt(skb, &prevhdr);
+ if (hlen < 0) {
+ err = hlen;
+ goto fail;
+ }
nexthdr = *prevhdr;
mtu = ip6_skb_dst_mtu(skb);
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index cd4252346a32..e9065b8d3af8 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -79,14 +79,13 @@ EXPORT_SYMBOL(ipv6_select_ident);
int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
{
u16 offset = sizeof(struct ipv6hdr);
- struct ipv6_opt_hdr *exthdr =
- (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
unsigned int packet_len = skb_tail_pointer(skb) -
skb_network_header(skb);
int found_rhdr = 0;
*nexthdr = &ipv6_hdr(skb)->nexthdr;
- while (offset + 1 <= packet_len) {
+ while (offset <= packet_len) {
+ struct ipv6_opt_hdr *exthdr;
switch (**nexthdr) {
@@ -107,13 +106,16 @@ int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
return offset;
}
- offset += ipv6_optlen(exthdr);
- *nexthdr = &exthdr->nexthdr;
+ if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
+ return -EINVAL;
+
exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
offset);
+ offset += ipv6_optlen(exthdr);
+ *nexthdr = &exthdr->nexthdr;
}
- return offset;
+ return -EINVAL;
}
EXPORT_SYMBOL(ip6_find_1stfragopt);
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index ac858c480f2f..b348cff47395 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -91,6 +91,8 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
* bytes to insert fragment header.
*/
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
+ if (unfrag_ip6hlen < 0)
+ return ERR_PTR(unfrag_ip6hlen);
nexthdr = *prevhdr;
*prevhdr = NEXTHDR_FRAGMENT;
unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +