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USB: idmouse: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-03-13 13:47:48 +01:00 committed by Greg Kroah-Hartman
parent 4495c08e84
commit b0addd3fa6
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/misc/idmouse.c
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@ -347,6 +347,9 @@ static int idmouse_probe(struct usb_interface *interface,
if (iface_desc->desc.bInterfaceClass != 0x0A) if (iface_desc->desc.bInterfaceClass != 0x0A)
return -ENODEV; return -ENODEV;
if (iface_desc->desc.bNumEndpoints < 1)
return -ENODEV;
/* allocate memory for our device state and initialize it */ /* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL); dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) if (dev == NULL)