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mac80211: fix use-after-free in defragmentation

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commit b8fff407a1 upstream.

Upon receiving the last fragment, all but the first fragment
are freed, but the multicast check for statistics at the end
of the function refers to the current skb (the last fragment)
causing a use-after-free bug.

Since multicast frames cannot be fragmented and we check for
this early in the function, just modify that check to also
do the accounting to fix the issue.

Reported-by: Yosef Khyal <yosefx.khyal@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Berg
2014-11-03 13:57:46 +01:00
committed by Greg Kroah-Hartman
parent b34fafa320
commit 2e613ff8d8
1 changed files with 7 additions and 7 deletions
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14
net/mac80211/rx.c
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@@ -1585,11 +1585,14 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
sc = le16_to_cpu(hdr->seq_ctrl);
frag = sc & IEEE80211_SCTL_FRAG;
if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
is_multicast_ether_addr(hdr->addr1))) {
/* not fragmented */
if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
goto out;
if (is_multicast_ether_addr(hdr->addr1)) {
rx->local->dot11MulticastReceivedFrameCount++;
goto out;
}
I802_DEBUG_INC(rx->local->rx_handlers_fragments);
if (skb_linearize(rx->skb))
@@ -1682,10 +1685,7 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
out:
if (rx->sta)
rx->sta->rx_packets++;
if (is_multicast_ether_addr(hdr->addr1))
rx->local->dot11MulticastReceivedFrameCount++;
else
ieee80211_led_rx(rx->local);
ieee80211_led_rx(rx->local);
return RX_CONTINUE;
}