From: Andrey Erokhin <a.erokhin@inango-systems.com>
Date: Wed, 6 Apr 2022 09:36:15 +0000 (+0300)
Subject: gpio-button-hotplug: fix data race
X-Git-Tag: v22.03.0-rc1~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f4124c2521c30a79270163c8d6c4ccda336fb8e;p=thirdparty%2Fopenwrt.git

gpio-button-hotplug: fix data race

bh_event_add_var can be called by multiple threads concurrently,
so it shall not use a static char buffer

Signed-off-by: Andrey Erokhin <a.erokhin@inango-systems.com>
(cherry picked from commit 1e991e09b73c309321d21b9cb706bd5139d952d2)
---

diff --git a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
index fcaf7f59de5..2b39ec8f3be 100644
--- a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
+++ b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
@@ -107,7 +107,7 @@ static struct bh_map button_map[] = {
 static __printf(3, 4)
 int bh_event_add_var(struct bh_event *event, int argv, const char *format, ...)
 {
-	static char buf[128];
+	char buf[128];
 	char *s;
 	va_list args;
 	int len;