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hnbgw_cn.c: Guard against null ss7 ptr during init

Fixes: Coverity CID#272989
Change-Id: Ic787d52a3c2e73ac272735a33b20bb94e29fad95
---
M src/osmo-hnbgw/hnbgw_cn.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/84/28484/1

diff --git a/src/osmo-hnbgw/hnbgw_cn.c b/src/osmo-hnbgw/hnbgw_cn.c
index 5499e5d..7c1dc9d 100644
--- a/src/osmo-hnbgw/hnbgw_cn.c
+++ b/src/osmo-hnbgw/hnbgw_cn.c
@@ -541,6 +541,8 @@
 		LOGP(DRANAP, LOGL_NOTICE, "No cs7 instance configured for IuCS nor IuPS,"
 		     " creating default instance\n");
 		ss7 = osmo_ss7_instance_find_or_create(gw, 0);
+		if (!ss7)
+			return -1;
 		ss7->cfg.primary_pc = (23 << 3) + 5;
 	}
 

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