linux-kernel - [PATCH 3.4 092/176] mac80211: fix multicast LED blinking and counter

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Message-Id: <1428569224-23820-92-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:40 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Andreas Müller <goo@...pelspeicher.org>,
	Johannes Berg <johannes.berg@...el.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 092/176] mac80211: fix multicast LED blinking and counter

From: Andreas Müller <goo@...pelspeicher.org>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit d025933e29872cb1fe19fc54d80e4dfa4ee5779c upstream.

As multicast-frames can't be fragmented, "dot11MulticastReceivedFrameCount"
stopped being incremented after the use-after-free fix. Furthermore, the
RX-LED will be triggered by every multicast frame (which wouldn't happen
before) which wouldn't allow the LED to rest at all.

Fixes https://bugzilla.kernel.org/show_bug.cgi?id=89431 which also had the
patch.

Fixes: b8fff407a180 ("mac80211: fix use-after-free in defragmentation")
Signed-off-by: Andreas Müller <goo@...pelspeicher.org>
[rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 net/mac80211/rx.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 32929b0..24f2a41 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1486,14 +1486,14 @@ 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))
-		goto out;
-
 	if (is_multicast_ether_addr(hdr->addr1)) {
 		rx->local->dot11MulticastReceivedFrameCount++;
-		goto out;
+		goto out_no_led;
 	}
 
+	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
+		goto out;
+
 	I802_DEBUG_INC(rx->local->rx_handlers_fragments);
 
 	if (skb_linearize(rx->skb))
@@ -1584,9 +1584,10 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 	status->rx_flags |= IEEE80211_RX_FRAGMENTED;
 
  out:
+	ieee80211_led_rx(rx->local);
+ out_no_led:
 	if (rx->sta)
 		rx->sta->rx_packets++;
-	ieee80211_led_rx(rx->local);
 	return RX_CONTINUE;
 }
 
-- 
1.9.1

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