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pespin gerrit-no-reply at lists.osmocom.orgpespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-sgsn/+/15330 Change subject: sgsn: Reject PdpActReq if no GTP pdp ctx exists ...................................................................... sgsn: Reject PdpActReq if no GTP pdp ctx exists It could happen that SGSN drops GTP side of a pdp ctx (pdp->lib=NULL) while still maintaing the other side (to notify about the entire pdp ctx being torn down). If a PdpActReq arrives during that time, we need to account for that situation, otherwise osmo-sgsn crashes accessing pdp->lib. If no pdp->lib is found at that time, let's reject the request and expect at some point later in time the entire pdp context will be destroyed and reestablished. Related: OS#4173 Change-Id: I6dd87557ebb26fdbd280504abde10d976acecf64 --- M src/gprs/gprs_gmm.c 1 file changed, 5 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-sgsn refs/changes/30/15330/1 diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c index e44b3ec..5a0f72f 100644 --- a/src/gprs/gprs_gmm.c +++ b/src/gprs/gprs_gmm.c @@ -2713,6 +2713,11 @@ /* Check if NSAPI is already in use */ pdp = sgsn_pdp_ctx_by_nsapi(mmctx, act_req->req_nsapi); if (pdp) { + /* Make sure pdp ctx was not already torn down on GTP side */ + if (!pdp->lib) { + gsm_cause = GSM_CAUSE_REACT_RQD; + goto no_context; + } /* We already have a PDP context for this TLLI + NSAPI tuple */ if (pdp->sapi == act_req->req_llc_sapi && pdp->ti == transaction_id) { -- To view, visit https://gerrit.osmocom.org/c/osmo-sgsn/+/15330 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-sgsn Gerrit-Branch: master Gerrit-Change-Id: I6dd87557ebb26fdbd280504abde10d976acecf64 Gerrit-Change-Number: 15330 Gerrit-PatchSet: 1 Gerrit-Owner: pespin <pespin at sysmocom.de> Gerrit-MessageType: newchange -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20190829/bf738b5e/attachment.htm>