In is_type_dhcprequest(), while parsing a DHCP message, if the entry we found in the option list is neither a padding nor the dhcp-type, we have to ignore it and jump as many bytes as its length + 1. The "+ 1" byte is given by the subtype field itself that has to be jumped too.

Reported-by: Marek Lindner lindner_marek@yahoo.de Signed-off-by: Antonio Quartulli ordex@autistici.org --- gateway_client.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/gateway_client.c b/gateway_client.c index 65a77a1..1f7e92d 100644 --- a/gateway_client.c +++ b/gateway_client.c @@ -563,10 +563,10 @@ static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) p++;

/* ...and then we jump over the data */ - if (pkt_len < *p) + if (pkt_len < 1 + (*p)) goto out; - pkt_len -= *p; - p += (*p); + pkt_len -= 1 + (*p); + p += 1 + (*p); } } out: