43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
From e56c79f4e863436d0fc6c48fed0db09b7a49e565 Mon Sep 17 00:00:00 2001
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From: Marek Lindner <lindner_marek@yahoo.de>
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Date: Mon, 4 Mar 2013 10:39:49 +0800
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Subject: [PATCH 1/3] batman-adv: verify tt len does not exceed packet len
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batadv_iv_ogm_process() accesses the packet using the tt_num_changes
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attribute regardless of the real packet len (assuming the length check
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was done before). Therefore a length check is needed to avoid reading
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random memory.
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Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
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---
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bat_iv_ogm.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c
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index 72fe1bb..d5be889 100644
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--- a/bat_iv_ogm.c
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+++ b/bat_iv_ogm.c
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@@ -1292,7 +1292,8 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,
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batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
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/* unpack the aggregated packets and process them one by one */
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- do {
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+ while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
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+ batadv_ogm_packet->tt_num_changes)) {
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tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
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batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
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@@ -1303,8 +1304,7 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,
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packet_pos = packet_buff + buff_pos;
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batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
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- } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
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- batadv_ogm_packet->tt_num_changes));
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+ }
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kfree_skb(skb);
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return NET_RX_SUCCESS;
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--
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1.7.10.4
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