mmc: mxcmmc: fix return value check of mmc_add_host()

[ Upstream commit cde600af7b413c9fe03e85c58c4279df90e91d13 ]

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().

Fixes: d96be879ff46 ("mmc: Add a MX2/MX3 specific SDHC driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221101063023.1664968-4-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index 1d5418e4efaeb0f2a07002b19e004079e9ce0bfe..05aca0372ab2e871ae604cbe6146917bc1318e71 100644 (file)
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -1169,7 +1169,9 @@ static int mxcmci_probe(struct platform_device *pdev)
        host->watchdog.function = &mxcmci_watchdog;
        host->watchdog.data = (unsigned long)mmc;
 
-       mmc_add_host(mmc);
+       ret = mmc_add_host(mmc);
+       if (ret)
+               goto out_free_dma;
 
        return 0;