From 5d27518bbd8343094188bdd81d40c0439f658243 Mon Sep 17 00:00:00 2001
From: Victor Julien <victor@inliniac.net>
Date: Mon, 3 Sep 2012 11:30:19 +0200
Subject: [PATCH] Make sure we never underflow len in DetectLoadSigFile

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

diff --git a/src/detect.c b/src/detect.c
index 8e70d83520..67104d72ca 100644
--- a/src/detect.c
+++ b/src/detect.c
@@ -526,7 +526,7 @@ int DetectLoadSigFile(DetectEngineCtx *de_ctx, char *sig_file, int *sigs_tot) {
             continue;
 
         /* Check for multiline rules. */
-        while (isspace(line[--len]));
+        while (len > 0 && isspace(line[--len]));
         if (line[len] == '\\') {
             multiline++;
             offset = len;