From: Sergi Delgado Segura <sergi.delgado.s@gmail.com>
Date: Tue, 20 Jul 2021 09:05:47 +0000 (+0200)
Subject: Enforces sig_rec length in message_signing
X-Git-Tag: v0.0.100~25^2
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=rust-lightning;a=commitdiff_plain;h=8a1c538f88ffc3f387ce3f54ded2d49ab9c9aa31

Enforces sig_rec length in message_signing
---

diff --git a/lightning/src/util/message_signing.rs b/lightning/src/util/message_signing.rs
index 2055b408..8beff835 100644
--- a/lightning/src/util/message_signing.rs
+++ b/lightning/src/util/message_signing.rs
@@ -36,6 +36,11 @@ fn sigrec_encode(sig_rec: RecoverableSignature) -> Vec<u8> {
 }
 
 fn sigrec_decode(sig_rec: Vec<u8>) -> Result<RecoverableSignature, Error> {
+    // Signature must be 64 + 1 bytes long (compact signature + recovery id)
+    if sig_rec.len() != 65 {
+        return Err(Error::InvalidSignature);
+    }
+
     let rsig = &sig_rec[1..];
     let rid = sig_rec[0] as i32 - 31;