Subject: [PATCH AUTOSEL 6.2 48/53] wifi: rtw89: debug: avoid invalid access on RTW89_DBG_SEL_MAC_30

From: Sasha Levin <[email-masked]>
Date: Sun, 26 Feb 2023 09:44:40 -0500

From: Zong-Zhe Yang <[email-masked]>

[ Upstream commit c074da21dd346e0cfef5d08b0715078d7aea7f8d ]

Only 8852C chip has valid pages on RTW89_DBG_SEL_MAC_30. To other chips,
this section is an address hole. It will lead to crash if trying to access
this section on chips except for 8852C. So, we avoid that.

Signed-off-by: Zong-Zhe Yang <[email-masked]>
Signed-off-by: Ping-Ke Shih <[email-masked]>
Signed-off-by: Kalle Valo <[email-masked]>
Link: https://lore.kernel.org/r/[email-masked]
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/net/wireless/realtek/rtw89/debug.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index 8297e35bfa52b..6730eea930ece 100644
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -615,6 +615,7 @@ rtw89_debug_priv_mac_reg_dump_select(struct file *filp,
 	struct seq_file *m = (struct seq_file *)filp->private_data;
 	struct rtw89_debugfs_priv *debugfs_priv = m->private;
 	struct rtw89_dev *rtwdev = debugfs_priv->rtwdev;
+	const struct rtw89_chip_info *chip = rtwdev->chip;
 	char buf[32];
 	size_t buf_size;
 	int sel;
@@ -634,6 +635,12 @@ rtw89_debug_priv_mac_reg_dump_select(struct file *filp,
 		return -EINVAL;
 	}
 
+	if (sel == RTW89_DBG_SEL_MAC_30 && chip->chip_id != RTL8852C) {
+		rtw89_info(rtwdev, "sel %d is address hole on chip %d\n", sel,
+			   chip->chip_id);
+		return -EINVAL;
+	}
+
 	debugfs_priv->cb_data = sel;
 	rtw89_info(rtwdev, "select mac page dump %d\n", debugfs_priv->cb_data);
 
-- 
2.39.0