ssl/ssl_lib.c: Avoid crash when SSL_CONNECTION is NULL

Detection for sc == NULL is performed after sc is used. Add the
check to the correct place.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/27241)

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 4c7b62e14232d0cbe6752406ce879e0dbd1354cd..a81b16c10974a5d7ac75879ee4ca7ffd655146bb 100644 (file)
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -4945,6 +4945,9 @@ int SSL_do_handshake(SSL *s)
         return ossl_quic_do_handshake(s);
 #endif
 
+    if (sc == NULL)
+        return -1;
+
     if (sc->handshake_func == NULL) {
         ERR_raise(ERR_LIB_SSL, SSL_R_CONNECTION_TYPE_NOT_SET);
         return -1;