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From: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Date: Wed, 10 Feb 2016 16:08:17 +0100
Subject: [PATCH] mac80211: fix wiphy supported_band access
Fix wiphy supported_band access in tx radiotap parsing. In particular,
info->band is always set to 0 (IEEE80211_BAND_2GHZ) since it has not
assigned yet. This cause a kernel crash on 5GHz only devices.
Move ieee80211_parse_tx_radiotap() after info->band assignment
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1890,10 +1890,6 @@ netdev_tx_t ieee80211_monitor_start_xmit
info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_CTL_INJECTED;
- /* process and remove the injection radiotap header */
- if (!ieee80211_parse_tx_radiotap(local, skb))
- goto fail;
-
rcu_read_lock();
/*
@@ -1955,6 +1951,10 @@ netdev_tx_t ieee80211_monitor_start_xmit
goto fail_rcu;
info->band = chandef->chan->band;
+ /* process and remove the injection radiotap header */
+ if (!ieee80211_parse_tx_radiotap(local, skb))
+ goto fail_rcu;
+
ieee80211_xmit(sdata, NULL, skb);
rcu_read_unlock();
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