asgardius/android_kernel_motorola_sm6225
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ASoC: fsl_spdif: Fix integer overflow when calculating divisors

Browse source 
The calculation code does
u64 = (u32 - u32) * 100000;

The 64 bits are of no help here as the type is casted only after the
multiplication, and therefore the result may overflow, possibly causing
inoptimal or wrong clock setup in an unfortunate case (the maximum
result value of the first substraction is currently 47999).

Fix the code to cast before multiplication.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Acked-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Anssi Hannula 2014-06-09 19:16:43 +03:00 committed by Mark Brown
parent e9b383dc94
commit c89c7e94bb
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
sound/soc/fsl/fsl_spdif.c
View file

@ -1076,7 +1076,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
goto out;
} else if (arate / rate[index] == 1) {
/* A little bigger than expect */
sub = (arate - rate[index]) * 100000;
sub = (u64)(arate - rate[index]) * 100000;
do_div(sub, rate[index]);
if (sub >= savesub)
continue;
@ -1086,7 +1086,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
spdif_priv->txrate[index] = arate;
} else if (rate[index] / arate == 1) {
/* A little smaller than expect */
sub = (rate[index] - arate) * 100000;
sub = (u64)(rate[index] - arate) * 100000;
do_div(sub, rate[index]);
if (sub >= savesub)
continue;