Change in osmo-sgsn[master]: sgsn_ggsn_ctx_drop_pdp: protect against nullpointer when MM is gone

[lynxis lazus]

lynxis lazus has submitted this change and it was merged. ( https://gerrit.osmocom.org/11020 )

Change subject: sgsn_ggsn_ctx_drop_pdp: protect against nullpointer when MM is gone
......................................................................

sgsn_ggsn_ctx_drop_pdp: protect against nullpointer when MM is gone

When the GGSN crashs, the SGSN will be notified after
it comes back. Because of the async operation,
the mm ctx could be already gone.

Change-Id: I507a8c2193c84f8dff7f5d669adcd3583331f289
---
M src/gprs/gprs_sgsn.c
1 file changed, 3 insertions(+), 1 deletion(-)

Approvals:
  Jenkins Builder: Verified
  Harald Welte: Looks good to me, approved
  Pau Espin Pedrol: Looks good to me, approved



diff --git a/src/gprs/gprs_sgsn.c b/src/gprs/gprs_sgsn.c
index 977ae48..dc0e7c0 100644
--- a/src/gprs/gprs_sgsn.c
+++ b/src/gprs/gprs_sgsn.c
@@ -707,7 +707,9 @@
 
 void sgsn_ggsn_ctx_drop_pdp(struct sgsn_pdp_ctx *pctx)
 {
-	if (pctx->mm->gmm_state == GMM_REGISTERED_NORMAL) {
+	/* the MM context can be deleted while the GGSN is not reachable or
+	 * if has been crashed. */
+	if (pctx->mm && pctx->mm->gmm_state == GMM_REGISTERED_NORMAL) {
 		gsm48_tx_gsm_deact_pdp_req(pctx, GSM_CAUSE_NET_FAIL, true);
 		sgsn_ggsn_ctx_remove_pdp(pctx->ggsn, pctx);
 	} else  {

-- 
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Gerrit-Project: osmo-sgsn
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I507a8c2193c84f8dff7f5d669adcd3583331f289
Gerrit-Change-Number: 11020
Gerrit-PatchSet: 2
Gerrit-Owner: lynxis lazus <lynxis at fe80.eu>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-Reviewer: lynxis lazus <lynxis at fe80.eu>
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