From: Phong Tran Date: Mon, 15 Jul 2019 15:08:14 +0000 (+0700) Subject: ISDN: hfcsusb: checking idx of ep configuration X-Git-Tag: v5.4-rc1~508^2~32 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f384e62a82ba5d85408405fdd6aeff89354deaa9;p=platform%2Fkernel%2Flinux-rpi.git ISDN: hfcsusb: checking idx of ep configuration 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=30a04378dac680c5d521304a00a86156bb913522 [2]: https://groups.google.com/d/msg/syzkaller-bugs/_6HBdge8F3E/OJn7wVNpBAAJ Signed-off-by: Phong Tran Signed-off-by: David S. Miller --- diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index 4c99739..0e22423 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;