From 16bbc3eb83728c03138191a5d23d84d38175fa26 Mon Sep 17 00:00:00 2001
From: Martin Kepplinger <martin.kepplinger@puri.sm>
Date: Wed, 29 Jan 2020 14:02:59 +0100
Subject: [PATCH] rsi: fix null pointer dereference during rsi_shutdown()
Git-commit: 16bbc3eb83728c03138191a5d23d84d38175fa26
Patch-mainline: v5.7-rc1
References: jsc#SLE-13430

Appearently the hw pointer can be NULL while the module is loaded and
in that case rsi_shutdown() crashes due to the unconditional dereference.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/rsi/rsi_91x_sdio.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c
index 1bebba4e8527..5d6143a55187 100644
--- a/drivers/net/wireless/rsi/rsi_91x_sdio.c
+++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c
@@ -1468,12 +1468,15 @@ static void rsi_shutdown(struct device *dev)
 	struct rsi_91x_sdiodev *sdev =
 		(struct rsi_91x_sdiodev *)adapter->rsi_dev;
 	struct ieee80211_hw *hw = adapter->hw;
-	struct cfg80211_wowlan *wowlan = hw->wiphy->wowlan_config;
 
 	rsi_dbg(ERR_ZONE, "SDIO Bus shutdown =====>\n");
 
-	if (rsi_config_wowlan(adapter, wowlan))
-		rsi_dbg(ERR_ZONE, "Failed to configure WoWLAN\n");
+	if (hw) {
+		struct cfg80211_wowlan *wowlan = hw->wiphy->wowlan_config;
+
+		if (rsi_config_wowlan(adapter, wowlan))
+			rsi_dbg(ERR_ZONE, "Failed to configure WoWLAN\n");
+	}
 
 	if (IS_ENABLED(CONFIG_RSI_COEX) && adapter->priv->coex_mode > 1 &&
 	    adapter->priv->bt_adapter) {
-- 
2.16.4