metag: copy_from_user() should zero the destination on access_ok() failure
[ Upstream commit 8ae95ed4 ] Cc: stable@vger.kernel.org Acked-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
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