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authorYang Yingliang <yangyingliang@huawei.com>2022-11-08 15:28:19 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2022-12-07 15:22:35 +0300
commit9e6e8c43726673ca2abcaac87640b9215fd72f4c (patch)
tree5ebd580769fa42292ca0d803c621d44cc61fbe89 /drivers/mmc
parent0b278ea226b103a291aed38e950fe032148f8c9b (diff)
downloadlinux-9e6e8c43726673ca2abcaac87640b9215fd72f4c.tar.xz
mmc: atmel-mci: fix return value check of mmc_add_host()
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@huawei.com> Link: https://lore.kernel.org/r/20221108122819.429975-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/atmel-mci.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 91d52ba7a39f..bb9bbf1c927b 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -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),