This is a note to let you know that I've just added the patch titled mmc: atmel-mci: fix return value check of mmc_add_host() to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-atmel-mci-fix-return-value-check-of-mmc_add_host.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 0d382c60ed8c5c0255c7b034ef78ddb52afc7260 Author: Yang Yingliang <yangyingliang@xxxxxxxxxx> Date: Tue Nov 8 20:28:19 2022 +0800 mmc: atmel-mci: fix return value check of mmc_add_host() [ Upstream commit 9e6e8c43726673ca2abcaac87640b9215fd72f4c ] 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: 7d2be0749a59 ("atmel-mci: Driver for Atmel on-chip MMC controllers") Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221108122819.429975-1-yangyingliang@xxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 444bd3a0a922..af85b32c6c1c 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -2223,6 +2223,7 @@ 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) @@ -2306,11 +2307,13 @@ 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),