[PATCH] mci: Do not access ext_csd on SD cards

[Sascha Hauer]

On Mon, Mar 24, 2025 at 09:14:15AM +0100, Sascha Hauer wrote:
> SD cards do not have a ext_csd so accessing it on an SD card results in
> a NULL pointer derefence. Move the production year check to
> mci_mmc_decode_cid() which is executed for MMC devices only. While at
> it do not access ext_csd directly. We have already populated
> mci->version, so use this to check for the MMC versions which need the
> production year adjustment.
> 
> Fixes: a4a78c4f32 ("mci: use struct cid")
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
>  drivers/mci/mci-core.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
> index c89322f61e..1e49969017 100644
> --- a/drivers/mci/mci-core.c
> +++ b/drivers/mci/mci-core.c
> @@ -2377,6 +2377,12 @@ static int mci_mmc_decode_cid(struct mci *card)
>  		return -EINVAL;
>  	}
>  
> +	if (mci->version >= MMC_VERSION_4_41) {
> +		/* Adjust production date as per JEDEC JESD84-B451 */
> +		if (mci->cid.year < 2010)
> +			mci->cid.year += 16;
> +	}

The variable is named "card" in this function, not "mci". Will fix while
applying.

Sascha


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