From 07af79bf63973ed728a3fd4ded1369e359e7c79d Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Mon, 16 Jun 2014 17:29:17 +0200
Subject: Prevent read past start of array

---
 src/whirligig.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/whirligig.c b/src/whirligig.c
index ea78edb8..2d36839b 100644
--- a/src/whirligig.c
+++ b/src/whirligig.c
@@ -311,7 +311,7 @@ int main(int argc, char *argv[])
 			pos--;
 		}
 
-		if ( (ser[pos] == -1) && (ser[pos-1] == -1) ) {
+		if ( (pos > 0) && (ser[pos] == -1) && (ser[pos-1] == -1) ) {
 			/* Series ready to process */
 			process_series(win, ser, mat, pos-2);
 			dump(win, ser, mat, window_len, pos);
-- 
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