From 0189cb57b96ff92f75e3680b3710a46dacd6509f Mon Sep 17 00:00:00 2001
From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Date: Mon, 19 Jul 2021 13:59:45 +0800
Subject: fbmem: Convert from atomic_t to refcount_t on fb_info->count

refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1626674392-55857-1-git-send-email-xiyuyang19@fudan.edu.cn
---
 include/linux/fb.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include/linux/fb.h')

diff --git a/include/linux/fb.h b/include/linux/fb.h
index a8dccd23c249..9023739e9a42 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_FB_H
 #define _LINUX_FB_H
 
+#include <linux/refcount.h>
 #include <linux/kgdb.h>
 #include <uapi/linux/fb.h>
 
@@ -435,7 +436,7 @@ struct fb_tile_ops {
 
 
 struct fb_info {
-	atomic_t count;
+	refcount_t count;
 	int node;
 	int flags;
 	/*
-- 
cgit