diff options
| -rw-r--r-- | drivers/mmc/core/mmc.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 6eb9a4ddcee8..2ed77066e8d6 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -293,12 +293,13 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } } - /* - * The EXT_CSD format is meant to be forward compatible. As long - * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV - * are authorized, see JEDEC JESD84-B50 section B.8. - */ card->ext_csd.rev = ext_csd[EXT_CSD_REV]; + if (card->ext_csd.rev > 7) { + pr_err("%s: unrecognised EXT_CSD revision %d\n", + mmc_hostname(card->host), card->ext_csd.rev); + err = -EINVAL; + goto out; + } card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0]; card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1]; |