5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx>
commit e7794c14fd73e5eb4a3e0ecaa5334d5a17377c50 upstream.
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 inadvertently regressed
the validation check done in mmc_blk_part_switch_pre() and
mmc_blk_part_switch_post(), so let's fix it.
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>
Link: https://lore.kernel.org/r/20231201153143.1449753-1-jorge@xxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/block.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -850,9 +850,10 @@ static const struct block_device_operati
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)
@@ -867,9 +868,10 @@ static int mmc_blk_part_switch_pre(struc
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);
@@ -3091,4 +3093,3 @@ module_exit(mmc_blk_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
-
