staging: bcm2835-camera: Initialise dev in v4l2_dev

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: staging: bcm2835-camera: Initialise dev in v4l2_dev Commit 42a2f6664e18 ("staging: vc04_services: Move global g_state to vchiq_state") changed mmal_init to pass dev->v4l2_dev.dev to vchiq_mmal_init, however nothing iniitialised dev->v4l2_dev, so we got a NULL pointer dereference. Set dev->v4l2_dev.dev during bcm2835_mmal_probe. The device pointer could be passed into v4l2_device_register to set it, however that also has other effects that would need additional changes.

References

• https://git.kernel.org/stable/c/06753f49336ab161ea0e249a0720125b81b7b31b
• https://git.kernel.org/stable/c/b70bdd4923e8b8edbacde2af83ca337bb7005261
• https://git.kernel.org/stable/c/98698ca0e58734bc5c1c24e5bbc7429f981cd186