net: lwm2m: fix buffer length check in lwm2m_engine_set
Previously, lwm2m_engine set would check against the max_data_len
parameter of the ressource, but didn't take into consideration the
(possibly changed) max_data_len returned by the pre_write callback.
Fixes #30541
Signed-off-by: Henning Fleddermann <henning.fleddermann@grandcentrix.net>
diff --git a/subsys/net/lib/lwm2m/lwm2m_engine.c b/subsys/net/lib/lwm2m/lwm2m_engine.c
index b4f3d62..0bc3b5d 100644
--- a/subsys/net/lib/lwm2m/lwm2m_engine.c
+++ b/subsys/net/lib/lwm2m/lwm2m_engine.c
@@ -1487,7 +1487,7 @@
}
/* check length (note: we add 1 to string length for NULL pad) */
- if (len > res_inst->max_data_len -
+ if (len > max_data_len -
(obj_field->data_type == LWM2M_RES_TYPE_STRING ? 1 : 0)) {
LOG_ERR("length %u is too long for res instance %d data",
len, path.res_id);
