frv: fix clear_user()
commit 3b8767a8f00cc6538ba6b1cf0f88502e2fd2eb90 upstream. It should check access_ok(). Otherwise a bunch of places turn into trivially exploitable rootholes. Signed-off-by:Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Willy Tarreau <w@1wt.eu>
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