Dmitry Antipov <dmantipov@xxxxxxxxx> writes: > 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@xxxxxxxxxxxxxxxxxxxxxxxxx > Closes: https://syzkaller.appspot.com/bug?extid=93cbd5fbb85814306ba1 > Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") > Signed-off-by: Dmitry Antipov <dmantipov@xxxxxxxxx> > --- > 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; I'll echo Kalle's preference for a proper if statement. But it should really be an early return above the line that sets *conn_rsp_epid (we shouldn't touch that on error). -Toke
