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isdn/gigaset: fix NULL-deref at probe

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Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: cf7776dc05 ("[PATCH] isdn4linux: Siemens Gigaset drivers -
direct USB connection")
Cc: stable <stable@vger.kernel.org>	# 2.6.17
Cc: Hansjoerg Lipp <hjlipp@web.de>

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johan Hovold 2017-03-13 13:39:01 +01:00 committed by David S. Miller
parent 67e194007b
commit 68c32f9c2a
1 changed files with 3 additions and 0 deletions
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3
drivers/isdn/gigaset/bas-gigaset.c
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@ -2317,6 +2317,9 @@ static int gigaset_probe(struct usb_interface *interface,
return -ENODEV;
}
if (hostif->desc.bNumEndpoints < 1)
return -ENODEV;
dev_info(&udev->dev,
"%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
__func__, le16_to_cpu(udev->descriptor.idVendor),