media: flexcop-usb: fix endpoint sanity check

commit bca243b1ce0e46be26f7c63b5591dfbb41f558e5 upstream.

commit 1b976fc6d684 ("media: b2c2-flexcop-usb: add sanity checking") added
an endpoint sanity check to address a NULL-pointer dereference on probe.
Unfortunately the check was done on the current altsetting which was later
changed.

Fix this by moving the sanity check to after the altsetting is changed.

Fixes: 1b976fc6d684 ("media: b2c2-flexcop-usb: add sanity checking")
Cc: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/usb/b2c2/flexcop-usb.c b/drivers/media/usb/b2c2/flexcop-usb.c
index 427cda457af68e49e09cfaff4a927ddc80ab5292..5104678f29b76a14e96bfae1cf4bbf18141cb7c3 100644 (file)
--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -510,6 +510,9 @@ static int flexcop_usb_init(struct flexcop_usb *fc_usb)
                return ret;
        }
 
+       if (fc_usb->uintf->cur_altsetting->desc.bNumEndpoints < 1)
+               return -ENODEV;
+
        switch (fc_usb->udev->speed) {
        case USB_SPEED_LOW:
                err("cannot handle USB speed because it is too slow.");
@@ -543,9 +546,6 @@ static int flexcop_usb_probe(struct usb_interface *intf,
        struct flexcop_device *fc = NULL;
        int ret;
 
-       if (intf->cur_altsetting->desc.bNumEndpoints < 1)
-               return -ENODEV;
-
        if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_usb))) == NULL) {
                err("out of memory\n");
                return -ENOMEM;