allow EVP_PKEY_CTX_free(NULL)

diff --git a/crypto/evp/pmeth_lib.c b/crypto/evp/pmeth_lib.c
index 5b8000d691c2f4667b9d20a94457eb0f6d5a5086..500aad967b896578cde12c0f8c85872fed8e23af 100644 (file)
--- a/crypto/evp/pmeth_lib.c
+++ b/crypto/evp/pmeth_lib.c
@@ -289,6 +289,8 @@ int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 
 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
        {
+       if (ctx == NULL)
+               return;
        if (ctx->pmeth && ctx->pmeth->cleanup)
                ctx->pmeth->cleanup(ctx);
        if (ctx->pkey)