[lvc-project] [PATCH] wifi: rtw88: always wait for both firmware loading attempts

[Dmitry Antipov]

In 'rtw_wait_firmware_completion()', always wait for both (regular and
wowlan) firmware loading attempts. Otherwise if 'rtw_usb_intf_init()'
has failed in 'rtw_usb_probe()', 'rtw_usb_disconnect()' may issue
'ieee80211_free_hw()' when one of 'rtw_load_firmware_cb()' (usually
the wowlan one) is still in progress, causing UAF detected by KASAN.

Fixes: c8e5695eae99 ("rtw88: load wowlan firmware if wowlan is supported")
Reported-by: syzbot+6c6c08700f9480c41fe3 at syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=6c6c08700f9480c41fe3
Signed-off-by: Dmitry Antipov <dmantipov at yandex.ru>
---
 drivers/net/wireless/realtek/rtw88/main.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 7ab7a988b123..33a7577557a5 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -1313,20 +1313,21 @@ static int rtw_wait_firmware_completion(struct rtw_dev *rtwdev)
 {
 	const struct rtw_chip_info *chip = rtwdev->chip;
 	struct rtw_fw_state *fw;
+	int ret = 0;
 
 	fw = &rtwdev->fw;
 	wait_for_completion(&fw->completion);
 	if (!fw->firmware)
-		return -EINVAL;
+		ret = -EINVAL;
 
 	if (chip->wow_fw_name) {
 		fw = &rtwdev->wow_fw;
 		wait_for_completion(&fw->completion);
 		if (!fw->firmware)
-			return -EINVAL;
+			ret = -EINVAL;
 	}
 
-	return 0;
+	return ret;
 }
 
 static enum rtw_lps_deep_mode rtw_update_lps_deep_mode(struct rtw_dev *rtwdev,
-- 
2.45.2