perf parse-event: Add memory allocation test for name terms

If the name memory allocation fails then propagate to the parser.

Committer notes:

Use $(BISON_FALLBACK_FLAGS) on the bison call so that we continue
building with older bison versions, before 3.81, where YYNOMEM isn't
present.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230627181030.95608-7-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/Build

@@ -246,7 +246,7 @@ $(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-flex.h: util/parse-
 
 $(OUTPUT)util/parse-events-bison.c $(OUTPUT)util/parse-events-bison.h: util/parse-events.y
 	$(call rule_mkdir)
-	$(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) $(BISON_FILE_PREFIX_MAP) \
+	$(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) $(BISON_FILE_PREFIX_MAP) $(BISON_FALLBACK_FLAGS) \
 		-o $(OUTPUT)util/parse-events-bison.c -p parse_events_
 
 $(OUTPUT)util/expr-flex.c $(OUTPUT)util/expr-flex.h: util/expr.l $(OUTPUT)util/expr-bison.c

tools/perf/util/parse-events.c

@@ -1973,8 +1973,11 @@ int parse_events_name(struct list_head *list, const char *name)
 	struct evsel *evsel;
 
 	__evlist__for_each_entry(list, evsel) {
-		if (!evsel->name)
+		if (!evsel->name) {
 			evsel->name = strdup(name);
+			if (!evsel->name)
+				return -ENOMEM;
+		}
 	}
 
 	return 0;

tools/perf/util/parse-events.y

@@ -263,7 +263,7 @@ PE_EVENT_NAME event_def
 	free($1);
 	if (err) {
 		free_list_evsel($2);
-		YYABORT;
+		YYNOMEM;
 	}
 	$$ = $2;
 }