From e66cc350bbc3dbf2debf2b1ba925841547eff421 Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Mon, 24 Oct 2022 09:22:01 +0100
Subject: [PATCH] Fix a lock in provider_remove_store_methods()

We were taking a read lock. It should have been a write lock.

Fixes #19474
---
 crypto/provider_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/provider_core.c b/crypto/provider_core.c
index efddbf74f8330..c05b2f5496e73 100644
--- a/crypto/provider_core.c
+++ b/crypto/provider_core.c
@@ -1208,7 +1208,7 @@ static int provider_remove_store_methods(OSSL_PROVIDER *prov)
     if (!freeing) {
         int acc;
 
-        if (!CRYPTO_THREAD_read_lock(prov->opbits_lock))
+        if (!CRYPTO_THREAD_write_lock(prov->opbits_lock))
             return 0;
         OPENSSL_free(prov->operation_bits);
         prov->operation_bits = NULL;