sm: Fix potential null access due to missing check

Change-Id: I15532898f00c62cb2a63973decb401e929517cb3
---
M src/sm/sm_prim.c
1 file changed, 13 insertions(+), 2 deletions(-)


git pull ssh://gerrit.osmocom.org:29418/libosmo-gprs refs/changes/86/32486/1

diff --git a/src/sm/sm_prim.c b/src/sm/sm_prim.c
index 6ec8af8..c0fbca4 100644
--- a/src/sm/sm_prim.c
+++ b/src/sm/sm_prim.c
@@ -239,8 +239,10 @@
 		OSMO_ASSERT(ms);
 	} else {
 		sme = gprs_sm_ms_get_pdp_ctx(ms, smreg->pdp_act_req.nsapi);
-		LOGSME(sme, LOGL_ERROR, "Rx SMREG-PDP-ACT.req for already existing PDP context\n");
-		return -EINVAL;
+		if (sme) {
+			LOGSME(sme, LOGL_ERROR, "Rx SMREG-PDP-ACT.req for already existing PDP context\n");
+			return -EINVAL;
+		}
 	}
 
 	sme = gprs_sm_entity_alloc(ms, smreg->pdp_act_req.nsapi);

