3.19.8-ckt11 -stable review patch. If anyone has any objections, please let me know.
------------------
From: "Janusz.Dziedzic@xxxxxxxxx" <Janusz.Dziedzic@xxxxxxxxx>
commit 519ee6918b91abdc4bc9720deae17599a109eb40 upstream.
In case of one shot NOA the interval can be 0, catch that
instead of potentially (depending on the driver) crashing
like this:
divide error: 0000 [#1] SMP
[...]
Call Trace:
<IRQ>
[<ffffffffc08e891c>] ieee80211_extend_absent_time+0x6c/0xb0 [mac80211]
[<ffffffffc08e8a17>] ieee80211_update_p2p_noa+0xb7/0xe0 [mac80211]
[<ffffffffc069cc30>] ath9k_p2p_ps_timer+0x170/0x190 [ath9k]
[<ffffffffc070adf8>] ath_gen_timer_isr+0xc8/0xf0 [ath9k_hw]
[<ffffffffc0691156>] ath9k_tasklet+0x296/0x2f0 [ath9k]
[<ffffffff8107ad65>] tasklet_action+0xe5/0xf0
[...]
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
net/mac80211/util.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 1ce38e7..c5e76cf 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2891,6 +2891,13 @@ ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
if (end > 0)
return false;
+ /* One shot NOA */
+ if (data->count[i] == 1)
+ return false;
+
+ if (data->desc[i].interval == 0)
+ return false;
+
/* End time is in the past, check for repetitions */
skip = DIV_ROUND_UP(-end, data->desc[i].interval);
if (data->count[i] < 255) {
--
1.9.1
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