From db03da82fd9ba932c1929ca96596665c199e1d31 Mon Sep 17 00:00:00 2001
From: Ravi Khadiwala <ravi@signal.org>
Date: Thu, 30 Jun 2022 20:15:49 -0500
Subject: [PATCH] boring: Fix memory leak in `Deriver`

---
 boring/src/derive.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/boring/src/derive.rs b/boring/src/derive.rs
index 20fe5c2e..08a47dfb 100644
--- a/boring/src/derive.rs
+++ b/boring/src/derive.rs
@@ -14,6 +14,14 @@ pub struct Deriver<'a>(*mut ffi::EVP_PKEY_CTX, PhantomData<&'a ()>);
 unsafe impl<'a> Sync for Deriver<'a> {}
 unsafe impl<'a> Send for Deriver<'a> {}
 
+impl<'a> Drop for Deriver<'a> {
+    fn drop(&mut self) {
+        unsafe {
+            ffi::EVP_PKEY_CTX_free(self.0);
+        }
+    }
+}
+
 #[allow(clippy::len_without_is_empty)]
 impl<'a> Deriver<'a> {
     /// Creates a new `Deriver` using the provided private key.