[PATCH] firmware: arm_scmi: Fix OOB in scmi_power_name_get()

[Geert Uytterhoeven]

scmi_power_name_get() does not validate the domain number passed by the
external caller, which may lead to an out-of-bounds access.

Fix this by returning "unknown" for invalid domains, like
scmi_reset_name_get() does.

Fixes: 76a6550990e296a7 ("firmware: arm_scmi: add initial support for power protocol")
Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
---
 drivers/firmware/arm_scmi/power.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
index 3aa84ceb6d2bab68..4a7215e02dec035d 100644
--- a/drivers/firmware/arm_scmi/power.c
+++ b/drivers/firmware/arm_scmi/power.c
@@ -204,8 +204,12 @@ scmi_power_name_get(const struct scmi_protocol_handle *ph,
 		    u32 domain)
 {
 	struct scmi_power_info *pi = ph->get_priv(ph);
-	struct power_dom_info *dom = pi->dom_info + domain;
+	struct power_dom_info *dom;
+
+	if (domain >= pi->num_domains)
+		return "unknown";
 
+	dom = pi->dom_info + domain;
 	return dom->name;
 }
 
-- 
2.43.0