Change approach to SSL_pending API

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #23995)

include/internal/quic_stream_map.h

@@ -504,10 +504,11 @@ static ossl_inline ossl_unused int ossl_quic_stream_recv_get_final_size(const QU
 }
 
 /*
- * Determines the number of bytes available still to be read, and whether a FIN
- * has yet to be read.
+ * Determines the number of bytes available still to be read, and (if
+ * include_fin is 1) whether a FIN or reset has yet to be read.
  */
-static ossl_inline ossl_unused int ossl_quic_stream_recv_pending(const QUIC_STREAM *s)
+static ossl_inline ossl_unused int ossl_quic_stream_recv_pending(const QUIC_STREAM *s,
+                                                                 int include_fin)
 {
     size_t avail;
     int fin = 0;
@@ -523,13 +524,13 @@ static ossl_inline ossl_unused int ossl_quic_stream_recv_pending(const QUIC_STRE
         if (!ossl_quic_rstream_available(s->rstream, &avail, &fin))
             avail = 0;
 
-        if (avail == 0 && fin)
+        if (avail == 0 && include_fin && fin)
             avail = 1;
 
         return avail;
 
     case QUIC_RSTREAM_STATE_RESET_RECVD:
-        return 1;
+        return include_fin;
 
     case QUIC_RSTREAM_STATE_DATA_READ:
     case QUIC_RSTREAM_STATE_RESET_READ:

ssl/quic/quic_impl.c

@@ -2986,11 +2986,13 @@ static size_t ossl_quic_pending_int(const SSL *s, int check_channel)
     }
 
     if (check_channel)
-        avail = ossl_quic_stream_recv_pending(ctx.xso->stream)
+        avail = ossl_quic_stream_recv_pending(ctx.xso->stream,
+                                              /*include_fin=*/1)
              || ossl_quic_channel_has_pending(ctx.qc->ch)
              || ossl_quic_channel_is_term_any(ctx.qc->ch);
     else
-        avail = ossl_quic_stream_recv_pending(ctx.xso->stream);
+        avail = ossl_quic_stream_recv_pending(ctx.xso->stream,
+                                              /*include_fin=*/0);
 
 out:
     qctx_unlock(&ctx);