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watchdog: pcwd_usb: fix NULL-deref at probe
commit46c319b848
upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Fixes:1da177e4c3
("Linux-2.6.12-rc2") Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -630,6 +630,9 @@ static int usb_pcwd_probe(struct usb_interface *interface,
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return -ENODEV;
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}
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if (iface_desc->desc.bNumEndpoints < 1)
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return -ENODEV;
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/* check out the endpoint: it has to be Interrupt & IN */
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endpoint = &iface_desc->endpoint[0].desc;
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