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authorAnssi Hannula <anssi.hannula@iki.fi>2014-06-09 19:16:43 +0300
committerMark Brown <broonie@linaro.org>2014-06-09 21:00:42 +0100
commitc89c7e94bb7d89b39471c79034e3ba1b25d817f5 (patch)
tree66d54740aadc7a1baf67aba55c843748bf2f6ed8 /sound
parente9b383dc940f4cba6876887ecb47df3082ec925e (diff)
downloadlinux-c89c7e94bb7d89b39471c79034e3ba1b25d817f5.tar.bz2
ASoC: fsl_spdif: Fix integer overflow when calculating divisors
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/fsl/fsl_spdif.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 9ea2dd471172..d7a60614dd21 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -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;