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| author | Karsten Keil <isdn@linux-pingi.de> | 2012-04-24 02:51:51 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-26 03:10:45 -0400 |
| commit | efef50a59f5536b94953838b05472eb490f6be09 (patch) | |
| tree | 355532b0888ff9f1227733dd3f979cde79af5cd3 /drivers/isdn | |
| parent | 52a637c2a5d96f12eadb17e03da9b3405cd58acf (diff) | |
| download | linux-efef50a59f5536b94953838b05472eb490f6be09.tar.bz2 | |
mISDN: Fix division by zero
If DTMF debug is set and tresh goes under 100, the printk will cause
a division by zero.
Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
| -rw-r--r-- | drivers/isdn/mISDN/dsp_dtmf.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/isdn/mISDN/dsp_dtmf.c b/drivers/isdn/mISDN/dsp_dtmf.c index 887860bdc63b..642f30be5ce2 100644 --- a/drivers/isdn/mISDN/dsp_dtmf.c +++ b/drivers/isdn/mISDN/dsp_dtmf.c @@ -222,16 +222,25 @@ coefficients: goto storedigit; } - if (dsp_debug & DEBUG_DSP_DTMFCOEFF) + if (dsp_debug & DEBUG_DSP_DTMFCOEFF) { + s32 tresh_100 = tresh/100; + + if (tresh_100 == 0) { + tresh_100 = 1; + printk(KERN_DEBUG + "tresh(%d) too small set tresh/100 to 1\n", + tresh); + } printk(KERN_DEBUG "a %3d %3d %3d %3d %3d %3d %3d %3d" " tr:%3d r %3d %3d %3d %3d %3d %3d %3d %3d\n", result[0] / 10000, result[1] / 10000, result[2] / 10000, result[3] / 10000, result[4] / 10000, result[5] / 10000, result[6] / 10000, result[7] / 10000, tresh / 10000, - result[0] / (tresh / 100), result[1] / (tresh / 100), - result[2] / (tresh / 100), result[3] / (tresh / 100), - result[4] / (tresh / 100), result[5] / (tresh / 100), - result[6] / (tresh / 100), result[7] / (tresh / 100)); + result[0] / (tresh_100), result[1] / (tresh_100), + result[2] / (tresh_100), result[3] / (tresh_100), + result[4] / (tresh_100), result[5] / (tresh_100), + result[6] / (tresh_100), result[7] / (tresh_100)); + } /* calc digit (lowgroup/highgroup) */ lowgroup = -1; |