CVE-2022-48801: iio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL

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

iio: buffer: Fix file related error handling in IIOBUFFERGETFDIOCTL

If we fail to copy the just created file descriptor to userland, we try to clean up by putting back 'fd' and freeing 'ib'. The code uses putunusedfd() for the former which is wrong, as the file descriptor was already published by fdinstall() which gets called internally by anoninodegetfd().

This makes the error handling code leaving a half cleaned up file descriptor table around and a partially destructed 'file' object, allowing userland to play use-after-free tricks on us, by abusing the still usable fd and making the code operate on a dangling 'file->privatedata' pointer.

Instead of leaving the kernel in a partially corrupted state, don't attempt to explicitly clean up and leave this to the process exit path that'll release any still valid fds, including the one created by the previous call to anoninodegetfd(). Simply return -EFAULT to indicate the error.