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mmc: atmel-mci: fix return value check of mmc_add_host()

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mmc_add_host() may return error, if we ignore its return value,
it will lead two issues:
1. The memory that allocated in mmc_alloc_host() is leaked.
2. In the remove() path, mmc_remove_host() will be called to
   delete device, but it's not added yet, it will lead a kernel
   crash because of null-ptr-deref in device_del().

So fix this by checking the return value and calling mmc_free_host()
in the error path.

Fixes: 7d2be0749a ("atmel-mci: Driver for Atmel on-chip MMC controllers")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221108122819.429975-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-08 20:28:19 +08:00 committed by Ulf Hansson
parent 0b278ea226
commit 9e6e8c4372
1 changed files with 6 additions and 3 deletions
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9
drivers/mmc/host/atmel-mci.c
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@ -2222,6 +2222,7 @@ static int atmci_init_slot(struct atmel_mci *host,
{
struct mmc_host *mmc;
struct atmel_mci_slot *slot;
int ret;
mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
if (!mmc)
@ -2305,11 +2306,13 @@ static int atmci_init_slot(struct atmel_mci *host,
host->slot[id] = slot;
mmc_regulator_get_supply(mmc);
mmc_add_host(mmc);
ret = mmc_add_host(mmc);
if (ret) {
mmc_free_host(mmc);
return ret;
}
if (gpio_is_valid(slot->detect_pin)) {
int ret;
timer_setup(&slot->detect_timer, atmci_detect_change, 0);
ret = request_irq(gpio_to_irq(slot->detect_pin),