batman-adv: Only read OGM2 tvlv_len after buffer len check

Multiple batadv_ogm2_packet can be stored in an skbuff. The functions
batadv_v_ogm_send_to_if() uses batadv_v_ogm_aggr_packet() to check if there
is another additional batadv_ogm2_packet in the skb or not before they
continue processing the packet.

The length for such an OGM2 is BATADV_OGM2_HLEN +
batadv_ogm2_packet->tvlv_len. The check must first check that at least
BATADV_OGM2_HLEN bytes are available before it accesses tvlv_len (which is
part of the header. Otherwise it might try read outside of the currently
available skbuff to get the content of tvlv_len.

Fixes: 9323158ef9f4 ("batman-adv: OGMv2 - implement originators logic")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index fad95ef64e01a9670ed66f9a81658718a14fc716..bc06e3cdfa84f63cc003867d4453a88249d3fb18 100644 (file)
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -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;