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ISDN: hfcsusb: checking idx of ep configuration

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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>
This commit is contained in:
Phong Tran 2019-07-15 22:08:14 +07:00 committed by David S. Miller
parent c5ec23bb19
commit f384e62a82
1 changed files with 3 additions and 0 deletions
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3
drivers/isdn/hardware/mISDN/hfcsusb.c
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@ -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;