On Tue, 8 Nov 2022 at 14:11, Yang Yingliang <yangyingliang@xxxxxxxxxx> wrote:
>
> 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: f0bf7f61b840 ("mmc: Add new via-sdmmc host controller driver")
> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Applied for next, thanks!
Kind regards
Uffe
> ---
> drivers/mmc/host/via-sdmmc.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c
> index 88662a90ed96..a2b0d9461665 100644
> --- a/drivers/mmc/host/via-sdmmc.c
> +++ b/drivers/mmc/host/via-sdmmc.c
> @@ -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;
>
> --
> 2.25.1
>
