mac80211: fix a crash in monitor mode injection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48719 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/kernel/mac80211/patches/334-mac80211-fix-wiphy-supported_band-access.patch b/package/kernel/mac80211/patches/334-mac80211-fix-wiphy-supported_band-access.patch
new file mode 100644 (file)
index 0000000..f8f4f09
--- /dev/null
+++ b/package/kernel/mac80211/patches/334-mac80211-fix-wiphy-supported_band-access.patch
@@ -0,0 +1,36 @@
+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();
+