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net: lwm2m: fix buffer length check in lwm2m_engine_set

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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>
This commit is contained in:
Henning Fleddermann 2020-12-09 02:12:51 +01:00 • committed by Jukka Rissanen
commit 061de0376a
1 changed files with 1 additions and 1 deletions
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subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -1487,7 +1487,7 @@ static int lwm2m_engine_set(char *pathstr, void *value, uint16_t len)
}
/* 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);