libtraceevent: Handle strdup() error in parse_option_name()

Modified internal function parse_option_name() to return error and
handle that error in function callers in case strdup() fails.

Link: https://lore.kernel.org/r/CAM9d7cizjF+fbK7YzmsBDgrx__4YAOsmEq67D3sWET8FF+YdFA@mail.gmail.com
Link: https://lore.kernel.org/linux-trace-devel/20200714103027.2477584-3-tz.stoyanov@gmail.com
Link: https://lore.kernel.org/linux-trace-devel/20200716092014.2613403-3-tz.stoyanov@gmail.com

Suggested-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200722011754.869289038@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/traceevent/event-plugin.c

@@ -254,7 +254,7 @@ void tep_plugin_remove_options(struct tep_plugin_option *options)
 	}
 }
 
-static void parse_option_name(char **option, char **plugin)
+static int parse_option_name(char **option, char **plugin)
 {
 	char *p;
 
@@ -265,8 +265,9 @@ static void parse_option_name(char **option, char **plugin)
 		*p = '\0';
 		*option = strdup(p + 1);
 		if (!*option)
-			return;
+			return -1;
 	}
+	return 0;
 }
 
 static struct tep_plugin_option *
@@ -325,7 +326,8 @@ int tep_plugin_add_option(const char *name, const char *val)
 	if (!option_str)
 		return -ENOMEM;
 
-	parse_option_name(&option_str, &plugin);
+	if (parse_option_name(&option_str, &plugin) < 0)
+		return -ENOMEM;
 
 	/* If the option exists, update the val */
 	for (op = trace_plugin_options; op; op = op->next) {