mirror of https://github.com/hak5/openwrt.git
50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
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diff -ur madwifi.old/net80211/ieee80211_input.c madwifi.dev/net80211/ieee80211_input.c
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--- madwifi.old/net80211/ieee80211_input.c 2007-05-21 17:53:39.000000000 +0200
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+++ madwifi.dev/net80211/ieee80211_input.c 2007-05-23 16:50:21.097957392 +0200
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@@ -695,13 +695,31 @@
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/* NB: assumes linear (i.e., non-fragmented) skb */
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+ /* check length > header */
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+ if (skb->len < sizeof(struct ether_header) + LLC_SNAPFRAMELEN
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+ + roundup(sizeof(struct athl2p_tunnel_hdr) - 2, 4) + 2) {
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+ IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
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+ ni->ni_macaddr, "data", "%s", "decap error");
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+ vap->iv_stats.is_rx_decap++;
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+ IEEE80211_NODE_STAT(ni, rx_decap);
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+ goto err;
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+ }
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+
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/* get to the tunneled headers */
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ath_hdr = (struct athl2p_tunnel_hdr *)
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skb_pull(skb, sizeof(struct ether_header) + LLC_SNAPFRAMELEN);
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- /* ignore invalid frames */
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- if(ath_hdr == NULL)
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+ eh_tmp = (struct ether_header *)
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+ skb_pull(skb, roundup(sizeof(struct athl2p_tunnel_hdr) - 2, 4) + 2);
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+ /* sanity check for malformed 802.3 length */
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+ frame_len = ntohs(eh_tmp->ether_type);
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+ if (skb->len < roundup(sizeof(struct ether_header) + frame_len, 4)) {
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+ IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
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+ ni->ni_macaddr, "data", "%s", "decap error");
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+ vap->iv_stats.is_rx_decap++;
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+ IEEE80211_NODE_STAT(ni, rx_decap);
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goto err;
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-
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+ }
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+
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/* only implementing FF now. drop all others. */
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if (ath_hdr->proto != ATH_L2TUNNEL_PROTO_FF) {
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IEEE80211_DISCARD_MAC(vap,
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@@ -714,10 +732,6 @@
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}
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vap->iv_stats.is_rx_ffcnt++;
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- /* move past the tunneled header, with alignment */
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- skb_pull(skb, roundup(sizeof(struct athl2p_tunnel_hdr) - 2, 4) + 2);
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- eh_tmp = (struct ether_header *)skb->data;
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-
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/* ether_type must be length as FF frames are always LLC/SNAP encap'd */
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frame_len = ntohs(eh_tmp->ether_type);
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