Properly deal with streams closing during parsing

src/core/transport/chttp2/internal.h

@@ -601,6 +601,8 @@ void grpc_chttp2_for_all_streams(
     void (*cb)(grpc_chttp2_transport_global *transport_global, void *user_data,
                grpc_chttp2_stream_global *stream_global));
 
+void grpc_chttp2_parsing_become_skip_parser(grpc_chttp2_transport_parsing *transport_parsing);
+
 #define GRPC_CHTTP2_CLIENT_CONNECT_STRING "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
 #define GRPC_CHTTP2_CLIENT_CONNECT_STRLEN \
   (sizeof(GRPC_CHTTP2_CLIENT_CONNECT_STRING) - 1)

src/core/transport/chttp2/parsing.c

@@ -327,6 +327,7 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
         if (!parse_frame_slice(transport_parsing, gpr_empty_slice(), 1)) {
           return 0;
         }
+        transport_parsing->incoming_stream = NULL;
         if (++cur == end) {
           transport_parsing->deframe_state = DTS_FH_0;
           return 1;
@@ -346,6 +347,7 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
           return 0;
         }
         transport_parsing->deframe_state = DTS_FH_0;
+        transport_parsing->incoming_stream = NULL;
         return 1;
       } else if ((gpr_uint32)(end - cur) >
                  transport_parsing->incoming_frame_size) {
@@ -358,6 +360,7 @@ int grpc_chttp2_perform_read(grpc_chttp2_transport_parsing *transport_parsing,
           return 0;
         }
         cur += transport_parsing->incoming_frame_size;
+        transport_parsing->incoming_stream = NULL;
         goto dts_fh_0; /* loop */
       } else {
         if (!parse_frame_slice(
@@ -447,7 +450,7 @@ static int init_skip_frame_parser(
   return 1;
 }
 
-static void become_skip_parser(
+void grpc_chttp2_parsing_become_skip_parser(
     grpc_chttp2_transport_parsing *transport_parsing) {
   init_skip_frame_parser(
       transport_parsing,
@@ -736,7 +739,7 @@ static int parse_frame_slice(grpc_chttp2_transport_parsing *transport_parsing,
       }
       return 1;
     case GRPC_CHTTP2_STREAM_ERROR:
-      become_skip_parser(transport_parsing);
+      grpc_chttp2_parsing_become_skip_parser(transport_parsing);
       if (stream_parsing) {
         stream_parsing->saw_rst_stream = 1;
         stream_parsing->rst_stream_reason = GRPC_CHTTP2_PROTOCOL_ERROR;

src/core/transport/chttp2_transport.c

@@ -702,6 +702,10 @@ static void remove_stream(grpc_chttp2_transport *t, gpr_uint32 id) {
   grpc_chttp2_stream *s = grpc_chttp2_stream_map_delete(&t->parsing_stream_map, id);
   GPR_ASSERT(s);
   s->global.in_stream_map = 0;
+  if (t->parsing.incoming_stream == &s->parsing) {
+    t->parsing.incoming_stream = NULL;
+    grpc_chttp2_parsing_become_skip_parser(&t->parsing);
+  }
   grpc_chttp2_list_remove_incoming_window_updated(&t->global, &s->global);
 }