From fa8a99258947a9ee3749fa472180542920cd471c Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Mon, 13 Jul 2020 22:00:40 +0200
Subject: [PATCH] Work around memory-aliasing in descriptor ParsePubkey

---
 src/script/descriptor.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
index 5fa128d62d1..6c5961f60e2 100644
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -826,7 +826,8 @@ std::unique_ptr<PubkeyProvider> ParsePubkey(uint32_t key_exp_index, const Span<c
     }
     if (origin_split.size() == 1) return ParsePubkeyInner(key_exp_index, origin_split[0], permit_uncompressed, out, error);
     if (origin_split[0].size() < 1 || origin_split[0][0] != '[') {
-        error = strprintf("Key origin start '[ character expected but not found, got '%c' instead", origin_split[0][0]);
+        error = strprintf("Key origin start '[ character expected but not found, got '%c' instead",
+                          origin_split[0].size() < 1 ? /** empty, implies split char */ ']' : origin_split[0][0]);
         return nullptr;
     }
     auto slash_split = Split(origin_split[0].subspan(1), '/');