[nginx] SSL: free pkey on SSL_CTX_set0_tmp_dh_pkey() failure.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/aeab41dfd260
branches:  
changeset: 7994:aeab41dfd260
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Mon Jan 17 17:05:12 2022 +0300
description:
SSL: free pkey on SSL_CTX_set0_tmp_dh_pkey() failure.

The behaviour was changed in OpenSSL 3.0.1:
https://git.openssl.org/?p=openssl.git;a=commitdiff;h=bf17b7b

diffstat:

 src/event/ngx_event_openssl.c |  3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diffs (13 lines):

diff -r 96ae8e57b3dd -r aeab41dfd260 src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c	Tue Jan 11 02:23:49 2022 +0300
+++ b/src/event/ngx_event_openssl.c	Mon Jan 17 17:05:12 2022 +0300
@@ -1383,6 +1383,9 @@ ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_
     if (SSL_CTX_set0_tmp_dh_pkey(ssl->ctx, dh) != 1) {
         ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
                       "SSL_CTX_set0_tmp_dh_pkey(\%s\") failed", file->data);
+#if (OPENSSL_VERSION_NUMBER >= 0x3000001fL)
+        EVP_PKEY_free(dh);
+#endif
         BIO_free(bio);
         return NGX_ERROR;
     }