linux-kernel - [PATCH 2/2] wifi: ray_cs: add sanity check on local->sram/rmem/amem

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Message-Id: <20230313065823.256731-2-dzm91@hust.edu.cn>
Date:   Mon, 13 Mar 2023 14:58:23 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] wifi: ray_cs: add sanity check on local->sram/rmem/amem

The ray_config uses ray_release as its unified error handling function.
However, it does not know if local->sram/rmem/amem succeeds or not.

Fix this by adding sanity check on local->sram/rmem/amem in the
ray_relase.

Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 drivers/net/wireless/ray_cs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 785a5be72b2b..47d9c71b63b5 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -733,9 +733,12 @@ static void ray_release(struct pcmcia_device *link)
 
 	del_timer_sync(&local->timer);
 
-	iounmap(local->sram);
-	iounmap(local->rmem);
-	iounmap(local->amem);
+	if (local->sram)
+		iounmap(local->sram);
+	if (local->rmem)
+		iounmap(local->rmem);
+	if (local->amem)
+		iounmap(local->amem);
 	pcmcia_disable_device(link);
 
 	dev_dbg(&link->dev, "ray_release ending\n");
-- 
2.39.2