From 60c51f1c381bbd93c70cfdf41c6688609a7956fc Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Sat, 10 Jan 2015 08:58:47 +0100
Subject: [PATCH] fail immediately on an empty signature

Github-Pull: #5634
Rebased-From: 8dccba6a45db0466370726ed462b9da2eae43bce
---
 src/key.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/key.cpp b/src/key.cpp
index e5943af79..a845ba13d 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -227,6 +227,9 @@ public:
     }
 
     bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) {
+        if (vchSig.empty())
+            return false;
+
         // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
         unsigned char *norm_der = NULL;
         ECDSA_SIG *norm_sig = ECDSA_SIG_new();