From f8c242908ad15bbd604d3bcb54961b7d454c43f8 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Fri, 22 Apr 2022 11:28:54 +0800
Subject: [PATCH] drm/rockchip: vop: fix possible null-ptr-deref in vop_bind()
Git-commit: f8c242908ad15bbd604d3bcb54961b7d454c43f8
Patch-mainline: v5.19-rc1
References: git-fixes
It will cause null-ptr-deref in resource_size(), if platform_get_resource()
returns NULL, move calling resource_size() after devm_ioremap_resource() that
will check 'res' to avoid null-ptr-deref.
Fixes: 2048e3286f34 ("drm: rockchip: Add basic drm driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220422032854.2995175-1-yangyingliang@huawei.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 3e8d9e2d1b67..d53037531f40 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -2118,10 +2118,10 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
vop_win_init(vop);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- vop->len = resource_size(res);
vop->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(vop->regs))
return PTR_ERR(vop->regs);
+ vop->len = resource_size(res);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
--
2.35.3