Expand corpus, fix crash

src/core/ext/transport/chttp2/transport/frame_data.c

@@ -159,6 +159,9 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
   }
 
   switch (p->state) {
+    case GRPC_CHTTP2_DATA_ERROR:
+      p->state = GRPC_CHTTP2_DATA_ERROR;
+      return GRPC_CHTTP2_STREAM_ERROR;
   fh_0:
     case GRPC_CHTTP2_DATA_FH_0:
       stream_parsing->stats.incoming.framing_bytes++;
@@ -172,6 +175,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
           break;
         default:
           gpr_log(GPR_ERROR, "Bad GRPC frame type 0x%02x", p->frame_type);
+          p->state = GRPC_CHTTP2_DATA_ERROR;
           return GRPC_CHTTP2_STREAM_ERROR;
       }
       if (++cur == end) {
@@ -218,13 +222,11 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
               message_flags, &p->incoming_frames);
     /* fallthrough */
     case GRPC_CHTTP2_DATA_FRAME:
+      grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
+                                               stream_parsing);
       if (cur == end) {
-        grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
-                                                 stream_parsing);
         return GRPC_CHTTP2_PARSE_OK;
       }
-      grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
-                                               stream_parsing);
       uint32_t remaining = (uint32_t)(end - cur);
       if (remaining == p->frame_size) {
         stream_parsing->stats.incoming.data_bytes += p->frame_size;

src/core/ext/transport/chttp2/transport/frame_data.h

@@ -49,7 +49,8 @@ typedef enum {
   GRPC_CHTTP2_DATA_FH_2,
   GRPC_CHTTP2_DATA_FH_3,
   GRPC_CHTTP2_DATA_FH_4,
-  GRPC_CHTTP2_DATA_FRAME
+  GRPC_CHTTP2_DATA_FRAME,
+  GRPC_CHTTP2_DATA_ERROR
 } grpc_chttp2_stream_state;
 
 typedef struct grpc_chttp2_incoming_byte_stream