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gitosis at osmocom.org gitosis at osmocom.orgThis is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "The OpenBSC GSM Base Station Controller (+MSC/HLR/SGSN)". The branch, master has been updated via a1613695d1472e61c85706a8daeb2f83ba5364dd (commit) from 2c16beeb64054c83dead557ff2ae8ab9eb2b84aa (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- http://cgit.osmocom.org/openbsc/commit/?id=a1613695d1472e61c85706a8daeb2f83ba5364dd commit a1613695d1472e61c85706a8daeb2f83ba5364dd Author: Neels Hofmeyr <nhofmeyr at sysmocom.de> Date: Sun Feb 19 01:14:39 2017 +0100 subscr_update_expire_lu(): fix (obscure) segfault To be paranoid, catch a NULL subscriber and/or bts in subscr_update_expire_lu(): print an error log and avoid segfault. (I'm not sure this would really happen in a normal situation.) During aggressive testing of Paging timeout, I came across this segfault in msc_release_connection() when conn->expire_timer_stopped is set but conn->subscr is NULL, at the subscr dereference after: if (conn->expire_timer_stopped) subscr_update_expire_lu(conn->subscr, conn->bts); I brought this situation about by a fabricated Paging fault, i.e. in gsm48_rx_rr_pag_resp() return 0 and don't call gsm48_handle_paging_resp() at all. Thus conn->subscr is still NULL when expire_timer_stopped is 1. When looking at CM Service Request handling, the conn->subscr is set before setting expire_timer_stopped = 1, which is a saner thing to do. But without my mad 'return 0', there is in fact no way to have a NULL subscriber there. It looks like all other code paths already do the same, but it's not that obvious (e.g. _gsm48_rx_mm_serv_req_sec_cb()). So rather catch this case of NULL conn->subscr, and while at it catch NULL bts as well. Change-Id: I430dd952b2b928bea7f8360f1e01bb3cccb0a395 ----------------------------------------------------------------------- Summary of changes: openbsc/src/libmsc/gsm_subscriber.c | 10 ++++++++++ 1 file changed, 10 insertions(+) hooks/post-receive -- The OpenBSC GSM Base Station Controller (+MSC/HLR/SGSN)