[lvc-project] [PATCH] wifi: ath9k: fix out-of-bounds endpoint index in htc_issue_send()
Dmitry Antipov
dmantipov at yandex.ru
Mon Oct 21 11:47:17 MSK 2024
Syzbot has reported the following UBSAN splat:
UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath9k/htc_hst.c:26:35
index 255 is out of range for type 'struct htc_endpoint[22]'
...
Call Trace:
...
__ubsan_handle_out_of_bounds+0x115/0x140
htc_send_epid+0x1e0/0x2d0
ath9k_wmi_cmd+0x31f/0x590
ath9k_regread+0xdc/0x140
? __pfx_ath9k_regread+0x10/0x10
? _raw_spin_unlock_irqrestore+0xae/0x110
? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
? __pfx_ath9k_regread+0x10/0x10
ath9k_hw_init+0x4b0/0x2230
? init_timer_key+0x171/0x2d0
ath9k_htc_probe_device+0xa66/0x1fe0
? __pfx_ath9k_htc_probe_device+0x10/0x10
? usb_hcd_submit_urb+0x345/0x1ae0
? usb_free_urb+0x9d/0x120
? ath9k_hif_usb_alloc_urbs+0x1077/0x1150
ath9k_htc_hw_init+0x32/0x70
ath9k_hif_usb_firmware_cb+0x240/0x4c0
? __pfx_ath9k_hif_usb_firmware_cb+0x10/0x10
request_firmware_work_func+0x106/0x1c0
...
IIUC https://syzkaller.appspot.com/text?tag=ReproC&x=1734b9f1180000 makes
an attempt to emulate ath9k USB device in somewhat weird and obscure way
so I'm not sure whether this may happen on a real hardware. OTOH whether
ending with ENDPOINT_UNUSED in 'htc_connect_service()' may indicate the
malfunctioned real device, it may be better to reject such a device with
-ENODEV.
Reported-by: syzbot+93cbd5fbb85814306ba1 at syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=93cbd5fbb85814306ba1
Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
Signed-off-by: Dmitry Antipov <dmantipov at yandex.ru>
---
drivers/net/wireless/ath/ath9k/htc_hst.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c
index eb631fd3336d..4288ef5b8df5 100644
--- a/drivers/net/wireless/ath/ath9k/htc_hst.c
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -295,7 +295,7 @@ int htc_connect_service(struct htc_target *target,
}
*conn_rsp_epid = target->conn_rsp_epid;
- return 0;
+ return target->conn_rsp_epid == ENDPOINT_UNUSED ? -ENODEV : 0;
err:
kfree_skb(skb);
return ret;
--
2.47.0
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