mac80211: fix use-after-free in defragmentation
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:
parent
2097903674
commit
15d4b0476f
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@ -1679,11 +1679,14 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
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sc = le16_to_cpu(hdr->seq_ctrl);
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frag = sc & IEEE80211_SCTL_FRAG;
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if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
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is_multicast_ether_addr(hdr->addr1))) {
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/* not fragmented */
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if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
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goto out;
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if (is_multicast_ether_addr(hdr->addr1)) {
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rx->local->dot11MulticastReceivedFrameCount++;
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goto out;
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}
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I802_DEBUG_INC(rx->local->rx_handlers_fragments);
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if (skb_linearize(rx->skb))
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@ -1776,10 +1779,7 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
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out:
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if (rx->sta)
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rx->sta->rx_packets++;
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if (is_multicast_ether_addr(hdr->addr1))
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rx->local->dot11MulticastReceivedFrameCount++;
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else
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ieee80211_led_rx(rx->local);
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ieee80211_led_rx(rx->local);
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return RX_CONTINUE;
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}
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