This is a note to let you know that I've just added the patch titled
mac80211: fix crash if bitrate calculation goes wrong
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mac80211-fix-crash-if-bitrate-calculation-goes-wrong.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d86aa4f8ca58898ec6a94c0635da20b948171ed7 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@xxxxxxxxx>
Date: Fri, 11 Oct 2013 15:47:06 +0200
Subject: mac80211: fix crash if bitrate calculation goes wrong
From: Johannes Berg <johannes.berg@xxxxxxxxx>
commit d86aa4f8ca58898ec6a94c0635da20b948171ed7 upstream.
If a frame's timestamp is calculated, and the bitrate
calculation goes wrong and returns zero, the system
will attempt to divide by zero and crash. Catch this
case and print the rate information that the driver
reported when this happens.
Reported-by: Thomas Lindroth <thomas.lindroth@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/mac80211/util.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2155,6 +2155,10 @@ u64 ieee80211_calculate_rx_timestamp(str
}
rate = cfg80211_calculate_bitrate(&ri);
+ if (WARN_ONCE(!rate,
+ "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
+ status->flag, status->rate_idx, status->vht_nss))
+ return 0;
/* rewind from end of MPDU */
if (status->flag & RX_FLAG_MACTIME_END)
Patches currently in stable-queue which might be from johannes.berg@xxxxxxxxx are
queue-3.11/mac80211-use-sta_info_get_bss-for-nl80211-tx-and-client-probing.patch
queue-3.11/mac80211-drop-spoofed-packets-in-ad-hoc-mode.patch
queue-3.11/mac80211-fix-crash-if-bitrate-calculation-goes-wrong.patch
queue-3.11/mac80211-update-sta-last_rx-on-acked-tx-frames.patch
queue-3.11/mac80211-correctly-close-cancelled-scans.patch
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