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Diffstat (limited to 'net/ipv6/exthdrs.c')
-rw-r--r--net/ipv6/exthdrs.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 50ec95f..6447dc4 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -144,6 +144,7 @@ static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
const unsigned char *nh = skb_network_header(skb);
int off = skb_network_header_len(skb);
int len = (skb_transport_header(skb)[1] + 1) << 3;
+ int padlen = 0;
if (skb_transport_offset(skb) + len > skb_headlen(skb))
goto bad;
@@ -158,6 +159,9 @@ static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
switch (nh[off]) {
case IPV6_TLV_PAD1:
optlen = 1;
+ padlen++;
+ if (padlen > 7)
+ goto bad;
break;
case IPV6_TLV_PADN:
@@ -166,7 +170,8 @@ static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
* of 8. 7 is therefore the highest valid value.
* See also RFC 4942, Section 2.1.9.5.
*/
- if (optlen > 7)
+ padlen += optlen;
+ if (padlen > 7)
goto bad;
/* RFC 4942 recommends receiving hosts to
* actively check PadN payload to contain
@@ -195,11 +200,19 @@ static bool ip6_parse_tlv(const struct tlvtype_proc *procs, struct sk_buff *skb)
if (ip6_tlvopt_unknown(skb, off) == 0)
return false;
}
+ padlen = 0;
break;
}
off += optlen;
len -= optlen;
}
+ /* This case will not be caught by above check since its padding
+ * length is smaller than 7:
+ * 1 byte NH + 1 byte Length + 6 bytes Padding
+ */
+ if ((padlen == 6) && ((off - skb_network_header_len(skb)) == 8))
+ goto bad;
+
if (len == 0)
return true;
bad:
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