From 61d890f88f1a46131ed75a95020756e4c8b29eb2 Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol Date: Thu, 16 Jan 2020 17:52:01 +0100 Subject: sccp: Fix null ptr access on malformed or unsupported msg received Detected while running a TTCN3 sending malformed SCCP message in SCCP_Tests_RAW.ttcn: sccp_user.c:174:12: runtime error: member access within null pointer of type 'struct xua_msg' ASAN:DEADLYSIGNAL ================================================================= ==6==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x7f2a11f93c5c bp 0x7ffefcf05c50 sp 0x7ffefcf05c10 T0) #0 0x7f2a11f93c5b in mtp_user_prim_cb /tmp/libosmo-sccp/src/sccp_user.c:174 #1 0x7f2a11fb48f9 in deliver_to_mtp_user /tmp/libosmo-sccp/src/osmo_ss7_hmrt.c:94 #2 0x7f2a11fb4c8a in hmdt_message_for_distribution /tmp/libosmo-sccp/src/osmo_ss7_hmrt.c:133 #3 0x7f2a11fb5c90 in m3ua_hmdc_rx_from_l2 /tmp/libosmo-sccp/src/osmo_ss7_hmrt.c:275 #4 0x7f2a11f6f5c2 in m3ua_rx_xfer /tmp/libosmo-sccp/src/m3ua.c:586 #5 0x7f2a11f70480 in m3ua_rx_msg /tmp/libosmo-sccp/src/m3ua.c:739 #6 0x7f2a11faee35 in xua_srv_conn_cb /tmp/libosmo-sccp/src/osmo_ss7.c:1623 #7 0x7f2a0f46d082 (/usr/lib/x86_64-linux-gnu/libosmonetif.so.8+0xb082) #8 0x7f2a1186c0be (/usr/lib/x86_64-linux-gnu/libosmocore.so.12+0xc0be) #9 0x7f2a1186c735 in osmo_select_main (/usr/lib/x86_64-linux-gnu/libosmocore.so.12+0xc735) #10 0x557378718219 in main /tmp/libosmo-sccp/examples/sccp_demo_user.c:264 #11 0x7f2a105ad2e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0) #12 0x557378717059 in _start (/usr/local/bin/sccp_demo_user+0x6059) Change-Id: Idafa8c9693d98ecd214b62155372e4db69e2a4a4 --- src/sccp_user.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/sccp_user.c b/src/sccp_user.c index 9df5817..386f424 100644 --- a/src/sccp_user.c +++ b/src/sccp_user.c @@ -171,6 +171,12 @@ static int mtp_user_prim_cb(struct osmo_prim_hdr *oph, void *ctx) case OSMO_PRIM(OSMO_MTP_PRIM_TRANSFER, PRIM_OP_INDICATION): /* Convert from SCCP to SUA in xua_msg format */ xua = osmo_sccp_to_xua(oph->msg); + if (!xua) { + LOGP(DLSCCP, LOGL_ERROR, "Couldn't convert SCCP to SUA: %s\n", + msgb_hexdump(oph->msg)); + rc = -1; + break; + } xua->mtp = omp->u.transfer; /* hand this primitive into SCCP via the SCRC code */ rc = scrc_rx_mtp_xfer_ind_xua(inst, xua); -- cgit v1.2.3