perf probe: Check group string length

In the kernel, the probe group string length is limited up to
MAX_EVENT_NAME_LEN (including the NULL terminator).

Check for this limitation and report an error if it is exceeded.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20241012204725.928794-3-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Author: Leo-Yan

tools/perf/util/probe-event.c

@@ -2868,6 +2868,12 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
 	else
 		group = PERFPROBE_GROUP;
 
+	if (strlen(group) >= MAX_EVENT_NAME_LEN) {
+		pr_err("Probe group string='%s' is too long (>= %d bytes)\n",
+			group, MAX_EVENT_NAME_LEN);
+		return -ENOMEM;
+	}
+
 	/* Get an unused new event name */
 	ret = get_new_event_name(buf, sizeof(buf), event, namelist,
 				 tev->point.retprobe, allow_suffix);