CVE-2021-47339

In the Linux kernel, the following vulnerability has been resolved: media:
v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot
bug report, mistakes in the compat ioctl implementation can lead to
uninitialized kernel stack data getting used as input for driver ioctl
handlers. The reported bug is now fixed, but it’s possible that other
related bugs are still present or get added in the future. As the drivers
need to check user input already, the possible impact is fairly low, but it
might still cause an information leak. To be on the safe side, always clear
the entire ioctl buffer before calling the conversion handler functions
that are meant to initialize them.