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path: root/drivers/mmc/core/sd.c
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-rw-r--r--drivers/mmc/core/sd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 265e1aeeb9d8..d3d32f9a2cb1 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -221,6 +221,14 @@ static int mmc_decode_scr(struct mmc_card *card)
if (scr->sda_spec3)
scr->cmds = UNSTUFF_BITS(resp, 32, 2);
+
+ /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
+ if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
+ !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
+ pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
+ return -EINVAL;
+ }
+
return 0;
}