[PATCH 4/9] mmc: pxamci: fix return value check of mmc_add_host()

From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-mmc@vger.kernel.org>
Cc: <ulf.hansson@linaro.org>, <yangyingliang@huawei.com>
Subject: [PATCH 4/9] mmc: pxamci: fix return value check of mmc_add_host()
Date: Tue, 1 Nov 2022 14:30:18 +0800	[thread overview]
Message-ID: <20221101063023.1664968-5-yangyingliang@huawei.com> (raw)
In-Reply-To: <20221101063023.1664968-1-yangyingliang@huawei.com>

mmc_add_host() may return error, if we ignore its return value, the memory
that allocated in mmc_alloc_host() will be leaked and it will lead a kernel
crash because of deleting not added device in the remove path.

So fix this by checking the return value and goto error path which will call
mmc_free_host(), besides, ->exit() need be called to uninit the pdata.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/mmc/host/pxamci.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index e4003f6058eb..2a988f942b6c 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -763,7 +763,12 @@ static int pxamci_probe(struct platform_device *pdev)
 			dev_warn(dev, "gpio_ro and get_ro() both defined\n");
 	}
 
-	mmc_add_host(mmc);
+	ret = mmc_add_host(mmc);
+	if (ret) {
+		if (host->pdata && host->pdata->exit)
+			host->pdata->exit(dev, mmc);
+		goto out;
+	}
 
 	return 0;
 
-- 
2.25.1

