pcu_l1_if: ignore frame numbers that exceed the valid range
osmo-bsc may send invalid frame numbers through the pcu-sock interface.
Lets make sure that incoming frame numbers do not exceed the valid
range.
Change-Id: Ib0cf1738be07733c95fc6c459a8a7c4cb2eeef26
Related: OS#5198
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 15ae94f..69629db 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -40,6 +40,7 @@
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/gsm48_rest_octets.h>
#include <osmocom/gsm/sysinfo.h>
+#include <osmocom/gsm/gsm0502.h>
#include <nacc_fsm.h>
}
@@ -623,6 +624,12 @@
"qta=%d, ra=0x%02x, fn=%u, cur_fn=%d, is_11bit=%d\n", rach_ind->sapi, rach_ind->qta,
rach_ind->ra, rach_ind->fn, current_fn, rach_ind->is_11bit);
+ if (OSMO_UNLIKELY(rach_ind->fn > GSM_TDMA_HYPERFRAME - 1)) {
+ LOGP(DL1IF, LOGL_ERROR, "RACH request contains fn=%u that exceeds valid limits (0-%u) -- ignored!\n",
+ rach_ind->fn, GSM_TDMA_HYPERFRAME - 1);
+ return -EINVAL;
+ }
+
struct rach_ind_params rip = {
.burst_type = (enum ph_burst_type) rach_ind->burst_type,
.is_11bit = rach_ind->is_11bit > 0,