Change in ...osmo-ggsn[master]: libgtp: announce pdp ctx deletion upon CreatePdpCtx being rejected

pespin gerrit-no-reply at
Wed Aug 21 13:51:49 UTC 2019

pespin has uploaded this change for review. (

Change subject: libgtp: announce pdp ctx deletion upon CreatePdpCtx being rejected

libgtp: announce pdp ctx deletion upon CreatePdpCtx being rejected

The libgtp application  may have already allocated related resources
associated to the pdp context, so we need to signal its deletion in
order to let the application free the resources.

This should fix the duplication of pdp contexts seen in osmo-ggsn when
"show pdp-context" related VTY commands are used.
It was spotted due to some MS requesting a v4v6 context on a
v4-only APN, where first v4 address was allocated, and then upon v6
allocation create_context_ind() called
gtp_create_context_resp(GTPCAUSE_MISSING_APN) but the first address was
not freed. Upon receiving the callback, osmo-ggsn should now free the
related resources.

Related: OS#4154
Change-Id: I6c6215a4ce478afabc78ffaf5ffb0cf829e41226
M ggsn/ggsn.c
M gtp/gtp.c
2 files changed, 3 insertions(+), 4 deletions(-)

  git pull ssh:// refs/changes/59/15259/1

diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index 95371a2..d71855d 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -386,7 +386,7 @@
 			LOGPPDP(LOGL_ERROR, pdp, "Cannot find/free IP Pool member\n");
-	if (apn->cfg.gtpu_mode == APN_GTPU_MODE_KERNEL_GTP) {
+	if (apn && apn->cfg.gtpu_mode == APN_GTPU_MODE_KERNEL_GTP) {
 		if (gtp_kernel_tunnel_del(pdp, apn->tun.cfg.dev_name)) {
 			LOGPPDP(LOGL_ERROR, pdp, "Cannot delete tunnel from kernel:%s\n",
diff --git a/gtp/gtp.c b/gtp/gtp.c
index 94c3245..becedd2 100644
--- a/gtp/gtp.c
+++ b/gtp/gtp.c
@@ -1296,9 +1296,8 @@
 	/* Now send off a reply to the peer */
 	gtp_create_pdp_resp(gsn, pdp->version, pdp, cause);
-	if (cause != GTPCAUSE_ACC_REQ) {
-		pdp_freepdp(pdp);
-	}
+	if (cause != GTPCAUSE_ACC_REQ)
+		gtp_freepdp(gsn, pdp);
 	return 0;

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Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Change-Id: I6c6215a4ce478afabc78ffaf5ffb0cf829e41226
Gerrit-Change-Number: 15259
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at>
Gerrit-MessageType: newchange
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