linux-kernel - [PATCH] video: fbdev: via: check the return value of ioremap() in viafb_lcd_get_mobile

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Message-Id: <20220225124528.26506-1-baijiaju1990@gmail.com>
Date:   Fri, 25 Feb 2022 04:45:28 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     rajur@...lsio.com, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] video: fbdev: via: check the return value of ioremap() in viafb_lcd_get_mobile_state()

The function ioremap() in viafb_lcd_get_mobile_state() can fail, so its
return value should be checked.

Fixes: ac6c97e20f1b ("viafb: lcd.c, lcd.h, lcdtbl.h")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/video/fbdev/via/lcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/via/lcd.c b/drivers/video/fbdev/via/lcd.c
index 088b962076b5..9aa331a4a605 100644
--- a/drivers/video/fbdev/via/lcd.c
+++ b/drivers/video/fbdev/via/lcd.c
@@ -954,6 +954,8 @@ bool viafb_lcd_get_mobile_state(bool *mobile)
 	u16 start_pattern;
 
 	biosptr = ioremap(romaddr, 0x10000);
+	if (!biosptr)
+		return false;
 	start_pattern = readw(biosptr);
 
 	/* Compare pattern */
-- 
2.17.1