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    Subject[PATCH 4.4 091/118] microblaze: fix copy_from_user()
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Al Viro <viro@zeniv.linux.org.uk>

    commit d0cf385160c12abd109746cad1f13e3b3e8b50b8 upstream.

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/microblaze/include/asm/uaccess.h | 9 ++++++---
    1 file changed, 6 insertions(+), 3 deletions(-)

    --- a/arch/microblaze/include/asm/uaccess.h
    +++ b/arch/microblaze/include/asm/uaccess.h
    @@ -373,10 +373,13 @@ extern long __user_bad(void);
    static inline long copy_from_user(void *to,
    const void __user *from, unsigned long n)
    {
    + unsigned long res = n;
    might_fault();
    - if (access_ok(VERIFY_READ, from, n))
    - return __copy_from_user(to, from, n);
    - return n;
    + if (likely(access_ok(VERIFY_READ, from, n)))
    + res = __copy_from_user(to, from, n);
    + if (unlikely(res))
    + memset(to + (n - res), 0, res);
    + return res;
    }

    #define __copy_to_user(to, from, n) \

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