Commit 7a3750ff authored by Lachlan Hodges's avatar Lachlan Hodges Committed by Johannes Berg
Browse files

wifi: mac80211: fix beacon interval calculation overflow 



As we are converting from TU to usecs, a beacon interval of
100*1024 usecs will lead to integer wrapping. To fix change
to use a u32.

Fixes: 057d5f4b ("mac80211: sync dtim_count to TSF")
Signed-off-by: default avatarLachlan Hodges <lachlan.hodges@morsemicro.com>
Link: https://patch.msgid.link/20250621123209.511796-1-lachlan.hodges@morsemicro.com


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 0e7facea

net/mac80211/util.c

+1 −1
Original line number Diff line number Diff line
@@ -3884,7 +3884,7 @@ void ieee80211_recalc_dtim(struct ieee80211_local *local, 
{

	u64 tsf = drv_get_tsf(local, sdata);

	u64 dtim_count = 0;

	u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;

	u32 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;

	u8 dtim_period = sdata->vif.bss_conf.dtim_period;

	struct ps_data *ps;

	u8 bcns_from_dtim;