From: Yang Yingliang yangyingliang@huawei.com
[ Upstream commit a525cad241c339ca00bf7ebf03c5180f2a9b767c ]
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().
Fix this by checking the return value and goto error path wihch will call mmc_free_host().
Fixes: a45c6cb81647 ("[ARM] 5369/1: omap mmc: Add new omap hsmmc controller for 2430 and 34xx, v3") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20221108121316.340354-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/omap_hsmmc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index aa9cc49206d1..5b6ede81fc9f 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -1987,7 +1987,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev) if (!ret) mmc->caps |= MMC_CAP_SDIO_IRQ;
- mmc_add_host(mmc); + ret = mmc_add_host(mmc); + if (ret) + goto err_irq;
if (mmc_pdata(host)->name != NULL) { ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);