diff options
| author | Janusz.Dziedzic@tieto.com <Janusz.Dziedzic@tieto.com> | 2015-10-27 08:35:11 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2015-11-03 10:40:57 +0100 |
| commit | 519ee6918b91abdc4bc9720deae17599a109eb40 (patch) | |
| tree | 1cdd87740da36b01d9c0ee1fb2758ee610e43980 /net/mac80211/util.c | |
| parent | e9829b9745b6e1683fd2a90842da498a2197299e (diff) | |
| download | linux-519ee6918b91abdc4bc9720deae17599a109eb40.tar.bz2 | |
mac80211: fix divide by zero when NOA update
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
[...]
Cc: stable@vger.kernel.org [3.16+, due to d463af4a1c34 using it]
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/util.c')
| -rw-r--r-- | net/mac80211/util.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 8274c86296f9..c5ed42f2f667 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -2958,6 +2958,13 @@ 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) { |