vfs: read file_handle only once in handle_to_path

We used to read file_handle twice.  Once to get the amount of extra
bytes, and once to fetch the entire structure.

This may be problematic since we do size verifications only after the
first read, so if the number of extra bytes changes in userspace between
the first and second calls, we'll have an incoherent view of
file_handle.

Instead, read the constant size once, and copy that over to the final
structure without having to re-read it again.

Git-commit: 161f873b89136eb1e69477c847d5a5033239d9ba
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git



Change-Id: Ie2d64cbb37752e70a89501de0b5861efd6a52f3b
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Zhoulu Luo <zluo@codeaurora.org>