Commit f2d51b20 authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by Alex Deucher

drm/amd/display: Fix potential integer overflow

Fix potential integer overflow by casting actual_calculated_clock_100hz
to u64, in order to give the compiler complete information about the
proper arithmetic to use.

Notice that such variable is used in a context that expects
an expression of type u64 (64 bits, unsigned) and the following
expression is currently being evaluated using 32-bit arithmetic:

actual_calculated_clock_100hz * post_divider

Fixes: 7a03fdf6 ("drm/amd/display: fix 64bit division issue on 32bit OS")
Addresses-Coverity-ID: 1501691 ("Unintentional integer overflow")
Signed-off-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent e96b1b29
......@@ -240,7 +240,7 @@ static bool calc_fb_divider_checking_tolerance(
pll_settings->calculated_pix_clk_100hz =
actual_calculated_clock_100hz;
pll_settings->vco_freq =
div_u64(actual_calculated_clock_100hz * post_divider, 10);
div_u64((u64)actual_calculated_clock_100hz * post_divider, 10);
return true;
}
return false;
......
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