Fix bug in TLSv1.3 PSK processing

The recent SSL error overhaul left a case where an error occurs but
SSLfatal() is not called.

Credit to OSSfuzz for finding this issue.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4847)

diff --git a/ssl/statem/extensions_srvr.c b/ssl/statem/extensions_srvr.c
index c626ba61c7a3d9816fc44ab092ddecf61787cdc4..b07376fe9e6a7387c956bb704d6f32c3bd12b2b0 100644 (file)
--- a/ssl/statem/extensions_srvr.c
+++ b/ssl/statem/extensions_srvr.c
@@ -850,11 +850,14 @@ int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
         }
     }
 
-    if (PACKET_remaining(&binder) != hashsize
-            || tls_psk_do_binder(s, md,
-                                 (const unsigned char *)s->init_buf->data,
-                                 binderoffset, PACKET_data(&binder), NULL,
-                                 sess, 0, ext) != 1) {
+    if (PACKET_remaining(&binder) != hashsize) {
+        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PARSE_CTOS_PSK,
+                 SSL_R_BAD_EXTENSION);
+        goto err;
+    }
+    if (tls_psk_do_binder(s, md, (const unsigned char *)s->init_buf->data,
+                          binderoffset, PACKET_data(&binder), NULL, sess, 0,
+                          ext) != 1) {
         /* SSLfatal() already called */
         goto err;
     }