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fs: add vfs_parse_fs_param_source() helper
Add a simple helper that filesystems can use in their parameter parser to parse the "source" parameter. A few places open-coded this function and that already caused a bug in the cgroup v1 parser that we fixed. Let's make it harder to get this wrong by introducing a helper which performs all necessary checks. Link: https://syzkaller.appspot.com/bug?id=6312526aba5beae046fdae8f00399f87aab48b12 Cc: Christoph Hellwig <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Dmitry Vyukov <[email protected]> Signed-off-by: Christian Brauner <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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