From: Karsten Keil <isdn@linux-pingi.de>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, isdn4linux@listserv.isdn4linux.de
Subject: [PATCH 08/28] mISDN: Fix division by zero
Date: Sat, 17 Mar 2012 11:03:31 +0100 [thread overview]
Message-ID: <20120423170549.E7B489FB98@pingi6.linux-pingi.de> (raw)
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>
---
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 887860b..642f30b 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;
--
1.7.3.4
reply other threads:[~2012-04-23 17:08 UTC|newest]
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