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authorJanusz.Dziedzic@tieto.com <Janusz.Dziedzic@tieto.com>2015-10-27 08:35:11 +0100
committerJohannes Berg <johannes.berg@intel.com>2015-11-03 10:40:57 +0100
commit519ee6918b91abdc4bc9720deae17599a109eb40 (patch)
tree1cdd87740da36b01d9c0ee1fb2758ee610e43980 /net/mac80211/util.c
parente9829b9745b6e1683fd2a90842da498a2197299e (diff)
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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.c7
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) {