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watchdog: pcwd_usb: fix NULL-deref at probe 

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")
Cc: stable <stable@vger.kernel.org>
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>
zero-colors
Johan Hovold 2017-03-13 13:49:45 +01:00 committed by Wim Van Sebroeck
parent ddd6d240b2
commit 46c319b848
1 changed files with 3 additions and 0 deletions
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3
drivers/watchdog/pcwd_usb.c
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@ -630,6 +630,9 @@ static int usb_pcwd_probe(struct usb_interface *interface,
return -ENODEV;
}
if (iface_desc->desc.bNumEndpoints < 1)
return -ENODEV;
/* check out the endpoint: it has to be Interrupt & IN */
endpoint = &iface_desc->endpoint[0].desc;