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    Subject[09/70] drm/radeon/kms: add bounds checking to avivo pll algo
    2.6.37-stable review patch.  If anyone has any objections, please let us know.

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

    From: Alex Deucher <alexdeucher@gmail.com>

    commit a4b40d5d97f5c9ad0b7f4bf2818291ca184bb433 upstream.

    Prevent divider overflow.
    Fixes:
    https://bugzilla.kernel.org/show_bug.cgi?id=28932

    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/gpu/drm/radeon/radeon_display.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    --- a/drivers/gpu/drm/radeon/radeon_display.c
    +++ b/drivers/gpu/drm/radeon/radeon_display.c
    @@ -461,6 +461,11 @@ static void avivo_get_fb_div(struct rade
    tmp *= target_clock;
    *fb_div = tmp / pll->reference_freq;
    *frac_fb_div = tmp % pll->reference_freq;
    +
    + if (*fb_div > pll->max_feedback_div)
    + *fb_div = pll->max_feedback_div;
    + else if (*fb_div < pll->min_feedback_div)
    + *fb_div = pll->min_feedback_div;
    }

    static u32 avivo_get_post_div(struct radeon_pll *pll,
    @@ -494,6 +499,11 @@ static u32 avivo_get_post_div(struct rad
    post_div--;
    }

    + if (post_div > pll->max_post_div)
    + post_div = pll->max_post_div;
    + else if (post_div < pll->min_post_div)
    + post_div = pll->min_post_div;
    +
    return post_div;
    }




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