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media: flexcop-usb: fix NULL-ptr deref in flexcop_usb_transfer_init()

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If usb_set_interface() failed, iface->cur_altsetting will
not be assigned and it will be used in flexcop_usb_transfer_init()
It may lead a NULL pointer dereference.

Check usb_set_interface() return value in flexcop_usb_init()
and return failed to avoid using this NULL pointer.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Yang Yingliang 2019-09-24 06:49:04 -03:00 committed by Mauro Carvalho Chehab
parent 43be77fa6c
commit 649cd16c43
1 changed files with 7 additions and 1 deletions
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8
drivers/media/usb/b2c2/flexcop-usb.c
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@ -504,7 +504,13 @@ urb_error:
static int flexcop_usb_init(struct flexcop_usb *fc_usb)
{
/* use the alternate setting with the larges buffer */
usb_set_interface(fc_usb->udev,0,1);
int ret = usb_set_interface(fc_usb->udev, 0, 1);
if (ret) {
err("set interface failed.");
return ret;
}
switch (fc_usb->udev->speed) {
case USB_SPEED_LOW:
err("cannot handle USB speed because it is too slow.");