From: Antonio Quartulli <ordex@autistici.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: [B.A.T.M.A.N.] [PATCH] batman-adv: fix wrong dhcp option list browsing
Date: Mon, 27 Feb 2012 11:29:53 +0100 [thread overview]
Message-ID: <1330338593-17809-1-git-send-email-ordex@autistici.org> (raw)
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:
--
1.7.3.4
next reply other threads:[~2012-02-27 10:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-27 10:29 Antonio Quartulli [this message]
2012-02-28 5:46 ` [B.A.T.M.A.N.] [PATCH] batman-adv: fix wrong dhcp option list browsing Marek Lindner
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