From 876a83024db3eef893cdc14dcf1377fd867331cf Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Sat, 2 Nov 2013 11:20:26 +1100
Subject: [PATCH] Sanity check for absurd target setting and divide by zero.

---
 cgminer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cgminer.c b/cgminer.c
index 2ea0d1f7..76bfcc2b 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -3114,6 +3114,8 @@ static void calc_diff(struct work *work, double known)
 		if (opt_scrypt)
 			d64 *= (double)65536;
 		dcut64 = le256todouble(work->target);
+		if (unlikely(!dcut64))
+			dcut64 = 1;
 		work->work_difficulty = d64 / dcut64;
 	}
 	difficulty = work->work_difficulty;