Commit 39dc8b8ea387 ("wifi: mac80211: pass parsed TPE data to drivers") breaks
ath11k, leading to kernel crash:
BUG: kernel NULL pointer dereference, address: 0000000000000018
RIP: 0010:ath11k_mac_get_eirp_power.isra.0+0x5b/0x80 [ath11k]
Call Trace:
<TASK>
ath11k_mac_fill_reg_tpc_info+0x3d6/0x800 [ath11k]
ath11k_mac_vdev_start_restart+0x412/0x4d0 [ath11k]
ath11k_mac_op_sta_state+0x7bc/0xbb0 [ath11k]
drv_sta_state+0xf1/0x5f0 [mac80211]
sta_info_insert_rcu+0x28d/0x530 [mac80211]
sta_info_insert+0xf/0x20 [mac80211]
ieee80211_prep_connection+0x3b4/0x4c0 [mac80211]
ieee80211_mgd_auth+0x363/0x600 [mac80211]
The issue scenario is, AP advertises power spectral density (PSD) values in its
transmit power envelope (TPE) IE and supports 160 MHz bandwidth in 6 GHz. When
connecting to this AP, in ath11k_mac_parse_tx_pwr_env(), the local variable
psd is true and then reg_tpc_info.num_pwr_levels is set to 8 due to 160 MHz
bandwidth. Note here ath11k fails to set reg_tpc_info.is_psd_power as TRUE due
to above commit. Then in ath11k_mac_fill_reg_tpc_info(), for each of the 8
power levels, for a PSD channel, ath11k_mac_get_psd_channel() is expected to
be called to get required information. However due to invalid
reg_tpc_info.is_psd_power, it is ath11k_mac_get_eirp_power() that gets called
and passed with pwr_lvl_idx as one of the arguments. Note this function
implicitly requires pwr_lvl_idx to be no more than 3. So when pwr_lvl_idx is
larger than that ath11k_mac_get_seg_freq() returns invalid center frequency,
with which as the input ieee80211_get_channel() returns NULL, then kernel
crashes due to NULL pointer dereference.
Fix it by setting reg_tpc_info.is_psd_power properly.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
Fixes: 39dc8b8ea387 ("wifi: mac80211: pass parsed TPE data to drivers")
Reported-by: Mikko Tiihonen <mikko.tiihonen@xxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219131
Signed-off-by: Baochen Qiang <quic_bqiang@xxxxxxxxxxx>
---
drivers/net/wireless/ath/ath11k/mac.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 71ef89be823b..f8068d2e848c 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -7912,6 +7912,7 @@ static void ath11k_mac_parse_tx_pwr_env(struct ath11k *ar,
}
if (psd) {
+ arvif->reg_tpc_info.is_psd_power = true;
arvif->reg_tpc_info.num_pwr_levels = psd->count;
for (i = 0; i < arvif->reg_tpc_info.num_pwr_levels; i++) {
base-commit: 1462e8e1c93ecb96b5820ec28f7cbbb8a5aeb732
--
2.25.1
