The hs_timing_cfg[] array is indexed using a value derived from the
"mshcN" alias in DT, which may lead to an out-of-bounds access.
Fix this by adding a range check.
Fixes: 7d92895208a008a2 ("mmc: dw_mmc-k3: Fix out-of-bounds access through DT alias")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Compile-tested only.
There is another possible out-of-bounds access in
drivers/mmc/host/dw_mmc.c:dw_mci_init_slot():
if (drv_data && drv_data->caps)
mmc->caps |= drv_data->caps[ctrl_id];
With ctrl_id derived from "mshcN".
Unfortunately the upper bound is not known at run-time, without adding
such a field to struct dw_mci_drv_data first.
---
drivers/mmc/host/dw_mmc-k3.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 73fd75c3c824904d..75ae5803b0db24dd 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -135,6 +135,9 @@ static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
if (priv->ctrl_id < 0)
priv->ctrl_id = 0;
+ if (priv->ctrl_id >= TIMING_MODE)
+ return -EINVAL;
+
host->priv = priv;
return 0;
}
--
2.7.4
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