r8152: add missing endpoint sanity check

Add missing endpoint sanity check to probe in order to prevent a
NULL-pointer dereference (or slab out-of-bounds access) when retrieving
the interrupt-endpoint bInterval on ndo_open() in case a device lacks
the expected endpoints.

Fixes: 40a82917b1d3 ("net/usb/r8152: enable interrupt transfer")
Cc: hayeswang <hayeswang@realtek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index c5ebf35..031cb8f 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -6597,6 +6597,9 @@ static int rtl8152_probe(struct usb_interface *intf,
                return -ENODEV;
        }
 
+       if (intf->cur_altsetting->desc.bNumEndpoints < 3)
+               return -ENODEV;
+
        usb_reset_device(udev);
        netdev = alloc_etherdev(sizeof(struct r8152));
        if (!netdev) {