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handover_fsm: send_handover_performed(): check lchan != NULL

The target lchan is expected to be valid on HO_RESULT_OK, but it's
still safer to check it against NULL before dereferencing.

Change-Id: Iee734c98dc79681808e7d75360c208a941cc6821
Related: 107391d8c ("handover_fsm: fix send_handover_performed() using wrong lchan")
---
M src/osmo-bsc/handover_fsm.c
1 file changed, 5 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/99/42599/1
diff --git a/src/osmo-bsc/handover_fsm.c b/src/osmo-bsc/handover_fsm.c
index cddb138..2017637 100644
--- a/src/osmo-bsc/handover_fsm.c
+++ b/src/osmo-bsc/handover_fsm.c
@@ -905,6 +905,11 @@
struct gsm0808_speech_codec sc;
int rc;

+ if (lchan == NULL) {
+ LOG_HO(conn, LOGL_ERROR, "Target lchan is NULL, can't send HANDOVER PERFORMED!\n");
+ return;
+ }
+
/* Cause 3.2.2.5 */
ho_perf_params.cause = GSM0808_CAUSE_HANDOVER_SUCCESSFUL;


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Gerrit-MessageType: newchange
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: Iee734c98dc79681808e7d75360c208a941cc6821
Gerrit-Change-Number: 42599
Gerrit-PatchSet: 1
Gerrit-Owner: fixeria <vyanitskiy@sysmocom.de>