On Fri, 1 Dec 2023 at 16:31, Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx> wrote:
>
> When RPMB was converted to a character device, it added support for
> multiple RPMB partitions (Commit 97548575bef3 ("mmc: block: Convert RPMB
> to a character device").
>
> One of the changes in this commit was transforming the variable
> target_part defined in __mmc_blk_ioctl_cmd into a bitmask.
>
> This inadvertedly regressed the validation check done in
> mmc_blk_part_switch_pre() and mmc_blk_part_switch_post().
>
> This commit fixes that regression.
>
> Fixes: 97548575bef3 ("mmc: block: Convert RPMB to a character device")
> Signed-off-by: Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx>
> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.14+
Applied for fixes, thanks!
Kind regards
Uffe
> ---
>
> v2:
> fixes parenthesis around condition
> v3:
> adds stable to commit header
> v4:
> fixes the stable version to v4.14
> adds Reviewed-by
>
> drivers/mmc/core/block.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 152dfe593c43..13093d26bf81 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -851,9 +851,10 @@ static const struct block_device_operations mmc_bdops = {
> static int mmc_blk_part_switch_pre(struct mmc_card *card,
> unsigned int part_type)
> {
> + const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
> int ret = 0;
>
> - if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
> + if ((part_type & mask) == mask) {
> if (card->ext_csd.cmdq_en) {
> ret = mmc_cmdq_disable(card);
> if (ret)
> @@ -868,9 +869,10 @@ static int mmc_blk_part_switch_pre(struct mmc_card *card,
> static int mmc_blk_part_switch_post(struct mmc_card *card,
> unsigned int part_type)
> {
> + const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
> int ret = 0;
>
> - if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
> + if ((part_type & mask) == mask) {
> mmc_retune_unpause(card->host);
> if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
> ret = mmc_cmdq_enable(card);
> @@ -3143,4 +3145,3 @@ module_exit(mmc_blk_exit);
>
> MODULE_LICENSE("GPL");
> MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
> -
> --
> 2.34.1
