[PATCH AUTOSEL 5.17 115/135] rtw89: cfo: check mac_id to avoid out-of-bounds

Sasha Levin
2022-05-30T14:03:28Z

From: Ping-Ke Shih <pkshih@realtek.com>

[ Upstream commit 97df85871a5b187609d30fca6d85b912d9e02f29 ]

Somehow, hardware reports incorrect mac_id and pollute memory. Check index
before we access the array.

UBSAN: array-index-out-of-bounds in rtw89/phy.c:2517:23
index 188 is out of range for type 's32 [64]'
CPU: 1 PID: 51550 Comm: irq/35-rtw89_pc Tainted: G OE
Call Trace:
<IRQ>
show_stack+0x52/0x58
dump_stack_lvl+0x4c/0x63
dump_stack+0x10/0x12
ubsan_epilogue+0x9/0x45
__ubsan_handle_out_of_bounds.cold+0x44/0x49
? __alloc_skb+0x92/0x1d0
rtw89_phy_cfo_parse+0x44/0x7f [rtw89_core]
rtw89_core_rx+0x261/0x871 [rtw89_core]
? __alloc_skb+0xee/0x1d0
rtw89_pci_napi_poll+0x3fa/0x4ea [rtw89_pci]
__napi_poll+0x33/0x1a0
net_rx_action+0x126/0x260
? __queue_work+0x217/0x4c0
__do_softirq+0xd9/0x315
? disable_irq_nosync+0x10/0x10
do_softirq.part.0+0x6d/0x90
</IRQ>
<TASK>
__local_bh_enable_ip+0x62/0x70
rtw89_pci_interrupt_threadfn+0x182/0x1a6 [rtw89_pci]
irq_thread_fn+0x28/0x60
irq_thread+0xc8/0x190
? irq_thread_fn+0x60/0x60
kthread+0x16b/0x190
? irq_thread_check_affinity+0xe0/0xe0
? set_kthread_struct+0x50/0x50
ret_from_fork+0x22/0x30
</TASK>

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220516005215.5878-4-pkshih@realtek.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/realtek/rtw89/phy.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/phy.c b/drivers/net/wireless/realtek/rtw89/phy.c
index 147009888de0..777ad4e8f45f 100644
--- a/drivers/net/wireless/realtek/rtw89/phy.c
+++ b/drivers/net/wireless/realtek/rtw89/phy.c
@@ -1872,6 +1872,11 @@ void rtw89_phy_cfo_parse(struct rtw89_dev *rtwdev, s16 cfo_val,
struct rtw89_cfo_tracking_info *cfo = &rtwdev->cfo_tracking;
u8 macid = phy_ppdu->mac_id;

+ if (macid >= CFO_TRACK_MAX_USER) {
+ rtw89_warn(rtwdev, "mac_id %d is out of range\n", macid);
+ return;
+ }
+
cfo->cfo_tail[macid] += cfo_val;
cfo->cfo_cnt[macid]++;
cfo->packet_count++;
--
2.35.1