Commit 6dbda2d0 authored by Johannes Berg's avatar Johannes Berg

mac80211: make sure data is accessible in EAPOL check

The code to allow EAPOL frames even when the station
isn't yet marked associated needs to check that the
incoming frame is long enough and due to paged RX it
also can't assume skb->data contains the right data,
it must use skb_copy_bits(). Fix this to avoid using
data that doesn't really exist.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 9b395bc3
...@@ -888,14 +888,16 @@ ieee80211_rx_h_check(struct ieee80211_rx_data *rx) ...@@ -888,14 +888,16 @@ ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
*/ */
if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
ieee80211_is_data_present(hdr->frame_control)) { ieee80211_is_data_present(hdr->frame_control)) {
u16 ethertype; unsigned int hdrlen;
u8 *payload; __be16 ethertype;
payload = rx->skb->data + hdrlen = ieee80211_hdrlen(hdr->frame_control);
ieee80211_hdrlen(hdr->frame_control);
ethertype = (payload[6] << 8) | payload[7]; if (rx->skb->len < hdrlen + 8)
if (cpu_to_be16(ethertype) == return RX_DROP_MONITOR;
rx->sdata->control_port_protocol)
skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
if (ethertype == rx->sdata->control_port_protocol)
return RX_CONTINUE; return RX_CONTINUE;
} }
......
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