From: Phong Tran <[email protected]> [ Upstream commit f384e62a82ba5d85408405fdd6aeff89354deaa9 ]
The syzbot test with random endpoint address which made the idx is overflow in the table of endpoint configuations. this adds the checking for fixing the error report from syzbot KASAN: stack-out-of-bounds Read in hfcsusb_probe [1] The patch tested by syzbot [2] Reported-by: [email protected] [1]: https://syzkaller.appspot.com/bug?id=30a04378dac680c5d521304a00a86156bb913522 [2]: https://groups.google.com/d/msg/syzkaller-bugs/_6HBdge8F3E/OJn7wVNpBAAJ Signed-off-by: Phong Tran <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/isdn/hardware/mISDN/hfcsusb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index 114f3bcba1b0..c60c7998af17 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -1963,6 +1963,9 @@ hfcsusb_probe(struct usb_interface *intf, const struct usb_device_id *id) /* get endpoint base */ idx = ((ep_addr & 0x7f) - 1) * 2; + if (idx > 15) + return -EIO; + if (ep_addr & 0x80) idx++; attr = ep->desc.bmAttributes; -- 2.20.1
