From: Ping-Ke Shih pkshih@realtek.com

Using a kernel with the Undefined Behaviour Sanity Checker (UBSAN) enabled, the following array overrun is logged:

================================================================================ UBSAN: array-index-out-of-bounds in /home/finger/wireless-drivers-next/drivers/net/wireless/realtek/rtw88/phy.c:1789:34 index 5 is out of range for type 'u8 [5]' CPU: 2 PID: 84 Comm: kworker/u16:3 Tainted: G O 5.12.0-rc5-00086-gd88bba47038e-dirty #651 Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.50 09/29/2014 Workqueue: phy0 ieee80211_scan_work [mac80211] Call Trace: dump_stack+0x64/0x7c ubsan_epilogue+0x5/0x40 __ubsan_handle_out_of_bounds.cold+0x43/0x48 rtw_get_tx_power_params+0x83a/drivers/net/wireless/realtek/rtw88/0xad0 [rtw_core] ? rtw_pci_read16+0x20/0x20 [rtw_pci] ? check_hw_ready+0x50/0x90 [rtw_core] rtw_phy_get_tx_power_index+0x4d/0xd0 [rtw_core] rtw_phy_set_tx_power_level+0xee/0x1b0 [rtw_core] rtw_set_channel+0xab/0x110 [rtw_core] rtw_ops_config+0x87/0xc0 [rtw_core] ieee80211_hw_config+0x9d/0x130 [mac80211] ieee80211_scan_state_set_channel+0x81/0x170 [mac80211] ieee80211_scan_work+0x19f/0x2a0 [mac80211] process_one_work+0x1dd/0x3a0 worker_thread+0x49/0x330 ? rescuer_thread+0x3a0/0x3a0 kthread+0x134/0x150 ? kthread_create_worker_on_cpu+0x70/0x70 ret_from_fork+0x22/0x30 ================================================================================

The statement where an array is being overrun is shown in the following snippet:

if (rate <= DESC_RATE11M) tx_power = pwr_idx_2g->cck_base[group]; else ====> tx_power = pwr_idx_2g->bw40_base[group];

The associated arrays are defined in main.h as follows:

struct rtw_2g_txpwr_idx { u8 cck_base[6]; u8 bw40_base[5]; struct rtw_2g_1s_pwr_idx_diff ht_1s_diff; struct rtw_2g_ns_pwr_idx_diff ht_2s_diff; struct rtw_2g_ns_pwr_idx_diff ht_3s_diff; struct rtw_2g_ns_pwr_idx_diff ht_4s_diff; };

The problem arises because the value of group is 5 for channel 14. The trivial increase in the dimension of bw40_base fails as this struct must match the layout of efuse. The fix is to add the rate as an argument to rtw_get_channel_group() and set the group for channel 14 to 4 if rate <= DESC_RATE11M.

This patch fixes commit fa6dfe6bff24 ("rtw88: resolve order of tx power setting routines")

Fixes: fa6dfe6bff24 ("rtw88: resolve order of tx power setting routines") Reported-by: Богдан Пилипенко bogdan.pylypenko107@gmail.com Signed-off-by: Larry Finger Larry.Finger@lwfinger.net Signed-off-by: Ping-Ke Shih pkshih@realtek.com Cc: Stable stable@vger.kernel.org --- drivers/net/wireless/realtek/rtw88/phy.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index e114ddecac09..0b3da5bef703 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -1584,7 +1584,7 @@ void rtw_phy_load_tables(struct rtw_dev *rtwdev) } EXPORT_SYMBOL(rtw_phy_load_tables);

-static u8 rtw_get_channel_group(u8 channel) +static u8 rtw_get_channel_group(u8 channel, u8 rate) { switch (channel) { default: @@ -1628,6 +1628,7 @@ static u8 rtw_get_channel_group(u8 channel) case 106: return 4; case 14: + return rate <= DESC_RATE11M ? 5 : 4; case 108: case 110: case 112: @@ -1879,7 +1880,7 @@ void rtw_get_tx_power_params(struct rtw_dev *rtwdev, u8 path, u8 rate, u8 bw, s8 *remnant = &pwr_param->pwr_remnant;

pwr_idx = &rtwdev->efuse.txpwr_idx_table[path]; - group = rtw_get_channel_group(ch); + group = rtw_get_channel_group(ch, rate);

/* base power index for 2.4G/5G */ if (IS_CH_2G_BAND(ch)) {