From: Matt Corallo <git@bluematt.me>
Date: Tue, 20 Oct 2020 17:59:02 +0000 (-0400)
Subject: [bindings] Fix CVecTempl clone operation behavior.
X-Git-Tag: v0.0.12~4^2~7
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=rust-lightning;a=commitdiff_plain;h=faa8ec5c21e685942e5bcafbe74c1f1ce7d54747

[bindings] Fix CVecTempl clone operation behavior.

CVecTempl previously called Vec.clone_from_slice() on a
newly-allocated Vec, which immediately panics as
[T].clone_from_slice() requires that the Vec/target slice already
has the same length as the source slice. This should have been
Vec.extend_from_slice() which exhibits the correct behavior.
---

diff --git a/lightning-c-bindings/src/c_types/mod.rs b/lightning-c-bindings/src/c_types/mod.rs
index 840bd7a4..19192779 100644
--- a/lightning-c-bindings/src/c_types/mod.rs
+++ b/lightning-c-bindings/src/c_types/mod.rs
@@ -320,7 +320,7 @@ impl<T: Clone> Clone for CVecTempl<T> {
 	fn clone(&self) -> Self {
 		let mut res = Vec::new();
 		if self.datalen == 0 { return Self::from(res); }
-		res.clone_from_slice(unsafe { std::slice::from_raw_parts_mut(self.data, self.datalen) });
+		res.extend_from_slice(unsafe { std::slice::from_raw_parts_mut(self.data, self.datalen) });
 		Self::from(res)
 	}
 }