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Commit a4b40d5d authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: add bounds checking to avivo pll algo 

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



Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent bd91572e

drivers/gpu/drm/radeon/radeon_display.c

+10 −0
Original line number Diff line number Diff line
@@ -793,6 +793,11 @@ static void avivo_get_fb_div(struct radeon_pll *pll, 
	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,
@@ -826,6 +831,11 @@ static u32 avivo_get_post_div(struct radeon_pll *pll, 
			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;

}