Usually it will be freed in tls_early_post_process_client_hello().
However if a ClientHello callback will be used and will return
SSL_CLIENT_HELLO_RETRY then tls_early_post_process_client_hello()
may never come to the point where pre_proc_exts is freed.
Fixes #12194
CLA: trivial
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/12330)
OPENSSL_free(s->ext.ocsp.resp);
OPENSSL_free(s->ext.alpn);
OPENSSL_free(s->ext.tls13_cookie);
+ if (s->clienthello != NULL)
+ OPENSSL_free(s->clienthello->pre_proc_exts);
OPENSSL_free(s->clienthello);
OPENSSL_free(s->pha_context);
EVP_MD_CTX_free(s->pha_dgst);