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    Subject[PATCH 3.16.y-ckt 115/130] x86/ldt: Further fix FPU emulation
    Date
    3.16.7-ckt17 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Andy Lutomirski <luto@kernel.org>

    commit 12e244f4b550498bbaf654a52f93633f7dde2dc7 upstream.

    The previous fix confused a selector with a segment prefix. Fix it.

    Compile-tested only.

    Cc: Juergen Gross <jgross@suse.com>
    Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
    Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    arch/x86/math-emu/get_address.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
    index d13cab2aec45..8300db71c2a6 100644
    --- a/arch/x86/math-emu/get_address.c
    +++ b/arch/x86/math-emu/get_address.c
    @@ -157,7 +157,7 @@ static long pm_address(u_char FPU_modrm, u_char segment,
    addr->selector = PM_REG_(segment);
    }

    - descriptor = FPU_get_ldt_descriptor(segment);
    + descriptor = FPU_get_ldt_descriptor(addr->selector);
    base_address = SEG_BASE_ADDR(descriptor);
    address = base_address + offset;
    limit = base_address

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