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-rw-r--r--net/netfilter/nf_synproxy_core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index b100c04a0e43..3d6d49420db8 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -31,6 +31,9 @@ synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
int length = (th->doff * 4) - sizeof(*th);
u8 buf[40], *ptr;
+ if (unlikely(length < 0))
+ return false;
+
ptr = skb_header_pointer(skb, doff + sizeof(*th), length, buf);
if (ptr == NULL)
return false;
@@ -47,6 +50,8 @@ synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
length--;
continue;
default:
+ if (length < 2)
+ return true;
opsize = *ptr++;
if (opsize < 2)
return true;