[PATCH][next] clk: imx: pll14xx: Fix potential integer overflow on multiplication

[Colin Ian King]

The calculation of fout is using int multiplication and assigning
the result to a u64, this can potentially overflow if the int variable
mdiv is too large. Fix this by making the 65536 a u64 value to ensure a
u64 multiplication is being performed to avoid the overflow.

Fixes: 53990cf9d5b4 ("clk: imx: pll14xx: consolidate rate calculation")
Signed-off-by: Colin Ian King <colin.i.king@xxxxxxxxx>
---
 drivers/clk/imx/clk-pll14xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
index d63564dbb12c..2afe361fc711 100644
--- a/drivers/clk/imx/clk-pll14xx.c
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -107,7 +107,7 @@ static long pll14xx_calc_rate(struct clk_pll14xx *pll, int mdiv, int pdiv,
 	u64 fout = prate;
 
 	/* fout = (m * 65536 + k) * Fin / (p * 65536) / (1 << sdiv) */
-	fout *= (mdiv * 65536 + kdiv);
+	fout *= (mdiv * 65536ULL + kdiv);
 	pdiv *= 65536;
 
 	do_div(fout, pdiv << sdiv);
-- 
2.46.2