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 <tranmanphong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1955,6 +1955,9 @@ hfcsusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
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/* get endpoint base */
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idx = ((ep_addr & 0x7f) - 1) * 2;
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if (idx > 15)
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return -EIO;
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if (ep_addr & 0x80)
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idx++;
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attr = ep->desc.bmAttributes;
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