Patchwork [3/4] mISDN: Fix division by zero

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Submitter Karsten Keil
Date April 24, 2012, 12:51 p.m.
Message ID <1335271912-5269-4-git-send-email-kkeil@linux-pingi.de>
Download mbox | patch
Permalink /patch/154670/
State Accepted
Delegated to: David Miller
Headers show

Comments

Karsten Keil - April 24, 2012, 12:51 p.m.
From: Karsten Keil <isdn@linux-pingi.de>

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(-)

Patch

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;