Fix stream_select() issue with OpenSSL buffer

Ensure data from OpenSSL internal buffer has been
transfered to PHP stream buffer before a select()
emulation operation is performed

Addresses bug #65137
https://bugs.php.net/bug.php?id=65137

Conflicts:
	ext/openssl/xp_ssl.c

1 files changed, 14 insertions, 1 deletions

diff --git a/ext/openssl/xp_ssl.c b/ext/openssl/xp_ssl.c
index d04b3161b2..ccc5af7df7 100644
--- a/ext/openssl/xp_ssl.c
+++ b/ext/openssl/xp_ssl.c
@@ -2276,7 +2276,20 @@ static int php_openssl_sockop_cast(php_stream *stream, int castas, void **ret TS
 
 		case PHP_STREAM_AS_FD_FOR_SELECT:
 			if (ret) {
-				*(php_socket_t *)ret = sslsock->s.socket;
+				if (sslsock->ssl_active) {
+					/* OpenSSL has an internal buffer which select() cannot see. If we don't
+					   fetch it into the stream's buffer, no activity will be reported on the
+					   stream even though there is data waiting to be read - but we only fetch
+					   the number of bytes OpenSSL has ready to give us since we weren't asked
+					   for any data at this stage. This is only likely to cause issues with
+					   non-blocking streams, but it's harmless to always do it. */
+					int bytes;
+					while ((bytes = SSL_pending(sslsock->ssl_handle)) > 0) {
+						php_stream_fill_read_buffer(stream, (size_t)bytes);
+					}
+				}
+
+				*(int *)ret = sslsock->s.socket;
 			}
 			return SUCCESS;