From 38184bf18da60174b43b2b5e4ba032ef80a992dc Mon Sep 17 00:00:00 2001
From: zelig <viktor.tron@gmail.com>
Date: Fri, 24 Jun 2016 14:48:09 +0200
Subject: [PATCH] swarm/api/http: server handler: check protocol substring
 length to fix slice out of bounds crash

---
 swarm/api/http/server.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/swarm/api/http/server.go b/swarm/api/http/server.go
index 945fc4f6e0..29945a9f77 100644
--- a/swarm/api/http/server.go
+++ b/swarm/api/http/server.go
@@ -86,8 +86,10 @@ func handler(w http.ResponseWriter, r *http.Request, a *api.Api) {
 			return
 		}
 	}
-	raw = proto[1:5] == "bzzr"
-	nameresolver = proto[1:5] != "bzzi"
+	if len(proto) > 4 {
+		raw = proto[1:5] == "bzzr"
+		nameresolver = proto[1:5] != "bzzi"
+	}
 
 	glog.V(logger.Debug).Infof(
 		"[BZZ] Swarm: %s request over protocol %s '%s' received.",