media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init()

In the Linux kernel, the following vulnerability has been resolved:

media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init()

KASAN reports a use-after-free:

BUG: KASAN: use-after-free in dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core]

Call Trace:

...

dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core]

vidtv_bridge_probe+0x7bf/0xa40 [dvb_vidtv_bridge]

platform_probe+0xb6/0x170

...

Allocated by task 1238:

...

dvb_register_device+0x1a7/0xa70 [dvb_core]

dvb_dmxdev_init+0x2af/0x4a0 [dvb_core]

vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge]

...

Freed by task 1238:

dvb_register_device+0x6d2/0xa70 [dvb_core]

dvb_dmxdev_init+0x2af/0x4a0 [dvb_core]

vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge]

...

It is because the error handling in vidtv_bridge_dvb_init() is wrong.

First, vidtv_bridge_dmx(dev)_init() will clean themselves when fail, but

goto fail_dmx(_dev): calls release functions again, which causes

use-after-free.

Also, in fail_fe, fail_tuner_probe and fail_demod_probe, j = i will cause

out-of-bound when i finished its loop (i == NUM_FE). And the loop

releasing is wrong, although now NUM_FE is 1 so it won't cause problem.

Fix this by correctly releasing everything.