From: Phong Tran tranmanphong@gmail.com
[ 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: syzbot+8750abbc3a46ef47d509@syzkaller.appspotmail.com
[1]: https://syzkaller.appspot.com/bug?id=30a04378dac680c5d521304a00a86156bb91352... [2]: https://groups.google.com/d/msg/syzkaller-bugs/_6HBdge8F3E/OJn7wVNpBAAJ
Signed-off-by: Phong Tran tranmanphong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- 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 4c99739b937e..0e224232f746 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -1955,6 +1955,9 @@ 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;