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mmc: via-sdmmc: 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().

Fix this by checking the return value and goto error path which
will call mmc_free_host().

Fixes: f0bf7f61b8 ("mmc: Add new via-sdmmc host controller driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221108130949.1067699-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-08 21:09:49 +08:00 committed by Ulf Hansson
parent 90935f16f2
commit e4e46fb61e
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/host/via-sdmmc.c
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@ -1151,7 +1151,9 @@ static int via_sd_probe(struct pci_dev *pcidev,
pcidev->subsystem_device == 0x3891)
sdhost->quirks = VIA_CRDR_QUIRK_300MS_PWRDELAY;
mmc_add_host(mmc);
ret = mmc_add_host(mmc);
if (ret)
goto unmap;
return 0;