Commit 5b161002 authored by David S. Miller's avatar David S. Miller

Merge tag 'batadv-net-for-davem-20190830' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here are two batman-adv bugfixes:

 - Fix OGM and OGMv2 header read boundary check,
   by Sven Eckelmann (2 patches)
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents c3d7a089 0ff0f15a
......@@ -277,17 +277,23 @@ static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
* batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached
* @buff_pos: current position in the skb
* @packet_len: total length of the skb
* @tvlv_len: tvlv length of the previously considered OGM
* @ogm_packet: potential OGM in buffer
*
* Return: true if there is enough space for another OGM, false otherwise.
*/
static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
__be16 tvlv_len)
static bool
batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
const struct batadv_ogm_packet *ogm_packet)
{
int next_buff_pos = 0;
next_buff_pos += buff_pos + BATADV_OGM_HLEN;
next_buff_pos += ntohs(tvlv_len);
/* check if there is enough space for the header */
next_buff_pos += buff_pos + sizeof(*ogm_packet);
if (next_buff_pos > packet_len)
return false;
/* check if there is enough space for the optional TVLV */
next_buff_pos += ntohs(ogm_packet->tvlv_len);
return (next_buff_pos <= packet_len) &&
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
......@@ -315,7 +321,7 @@ static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
/* adjust all flags and log packets */
while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
batadv_ogm_packet->tvlv_len)) {
batadv_ogm_packet)) {
/* we might have aggregated direct link packets with an
* ordinary base packet
*/
......@@ -1704,7 +1710,7 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,
/* unpack the aggregated packets and process them one by one */
while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
ogm_packet->tvlv_len)) {
ogm_packet)) {
batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
ogm_offset += BATADV_OGM_HLEN;
......
......@@ -631,17 +631,23 @@ batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv,
* batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated
* @buff_pos: current position in the skb
* @packet_len: total length of the skb
* @tvlv_len: tvlv length of the previously considered OGM
* @ogm2_packet: potential OGM2 in buffer
*
* Return: true if there is enough space for another OGM, false otherwise.
*/
static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len,
__be16 tvlv_len)
static bool
batadv_v_ogm_aggr_packet(int buff_pos, int packet_len,
const struct batadv_ogm2_packet *ogm2_packet)
{
int next_buff_pos = 0;
next_buff_pos += buff_pos + BATADV_OGM2_HLEN;
next_buff_pos += ntohs(tvlv_len);
/* check if there is enough space for the header */
next_buff_pos += buff_pos + sizeof(*ogm2_packet);
if (next_buff_pos > packet_len)
return false;
/* check if there is enough space for the optional TVLV */
next_buff_pos += ntohs(ogm2_packet->tvlv_len);
return (next_buff_pos <= packet_len) &&
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
......@@ -818,7 +824,7 @@ int batadv_v_ogm_packet_recv(struct sk_buff *skb,
ogm_packet = (struct batadv_ogm2_packet *)skb->data;
while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
ogm_packet->tvlv_len)) {
ogm_packet)) {
batadv_v_ogm_process(skb, ogm_offset, if_incoming);
ogm_offset += BATADV_OGM2_HLEN;
......
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