From 91e1332011ca647362f95f34ae6c530640bfef98 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Sat, 10 Jan 2015 09:14:17 +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 8a1bfef771a..7fcb17d574f 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -376,6 +376,9 @@ bool CKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& v
 
 bool CKey::Verify(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();