[stable] fanotify: info leak in copy_event_to_user()

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This fixes CVE-2013-2148 and seems to be a good candidate for stable
kernels:

commit de1e0c40aceb9d5bff09c3a3b97b2f1b178af53f
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date:   Mon Jul 8 15:59:40 2013 -0700

    fanotify: info leak in copy_event_to_user()
    
    The ->reserved field isn't cleared so we leak one byte of stack
    information to userspace.

Cheers,
-- 
Luis
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