hotplug: validate expression name element

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/hotplug-rule.c b/hotplug-rule.c
index 7508b1d..7e9c16a 100644 (file)
--- a/hotplug-rule.c
+++ b/hotplug-rule.c
@@ -306,7 +306,8 @@ static int rule_process_expr(struct blob_attr *cur, struct blob_attr *msg)
        bool found;
        int ret;
 
-       if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY) {
+       if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY ||
+           blobmsg_type(blobmsg_data(cur)) != BLOBMSG_TYPE_STRING) {
                rule_error(cur, "Unexpected element type");
                return -1;
        }