Add locking to CRYPTO_secure_used

Coverity issue 1551719 noted CRYPTO_secure_used referenced a shared
variable without taking the appropriate read lock.  Add that.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/22802)

diff --git a/crypto/mem_sec.c b/crypto/mem_sec.c
index 557c697c9aaf688b82bec3ae78bb2f3f71e8ac5f..269c7dcb6d41790cae83de792c446800ea65d5c6 100644 (file)
--- a/crypto/mem_sec.c
+++ b/crypto/mem_sec.c
@@ -260,11 +260,17 @@ int CRYPTO_secure_allocated(const void *ptr)
 
 size_t CRYPTO_secure_used(void)
 {
+    size_t ret = 0;
+
 #ifndef OPENSSL_NO_SECURE_MEMORY
-    return secure_mem_used;
-#else
-    return 0;
+    if (!CRYPTO_THREAD_read_lock(sec_malloc_lock))
+        return 0;
+
+    ret = secure_mem_used;
+
+    CRYPTO_THREAD_unlock(sec_malloc_lock);
 #endif /* OPENSSL_NO_SECURE_MEMORY */
+    return ret;
 }
 
 size_t CRYPTO_secure_actual_size(void *ptr)