We are very very rarely seeing this crash:

    0 0x7f36ba48e389 in prefix_list_apply_ext lib/plist.c:789
    1 0x55eff3fa4126 in subgroup_announce_check bgpd/bgp_route.c:2334
    2 0x55eff3fa858e in subgroup_process_announce_selected bgpd/bgp_route.c:3440
    3 0x55eff4016488 in subgroup_announce_table bgpd/bgp_updgrp_adv.c:808
    4 0x55eff401664e in subgroup_announce_route bgpd/bgp_updgrp_adv.c:861
    5 0x55eff40111df in peer_af_announce_route bgpd/bgp_updgrp.c:2223
    6 0x55eff3f884cb in bgp_announce_route_timer_expired bgpd/bgp_route.c:5892
    7 0x7f36ba4ec239 in event_call lib/event.c:2019
    8 0x7f36ba41a22a in frr_run lib/libfrr.c:1295
    9 0x55eff3e668b7 in main bgpd/bgp_main.c:557
    10 0x7f36b9e2d249 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
    11 0x7f36b9e2d304 in __libc_start_main_impl ../csu/libc-start.c:360
    12 0x55eff3e64a30 in _start (/home/ci/cibuild.1407/frr-source/bgpd/.libs/bgpd+0x2fda30)
0x608000037038 is located 24 bytes inside of 88-byte region [0x608000037020,0x608000037078)
freed by thread T0 here:
    0 0x7f36ba8b76a8 in __interceptor_free ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:52
    1 0x7f36ba439bd7 in qfree lib/memory.c:131
    2 0x7f36ba48d3a3 in prefix_list_free lib/plist.c:156
    3 0x7f36ba48d3a3 in prefix_list_delete lib/plist.c:247
    4 0x7f36ba48fbef in prefix_bgp_orf_remove_all lib/plist.c:1516
    5 0x55eff3f679c4 in bgp_route_refresh_receive bgpd/bgp_packet.c:2841
    6 0x55eff3f70bab in bgp_process_packet bgpd/bgp_packet.c:4069
    7 0x7f36ba4ec239 in event_call lib/event.c:2019
    8 0x7f36ba41a22a in frr_run lib/libfrr.c:1295
    9 0x55eff3e668b7 in main bgpd/bgp_main.c:557
    10 0x7f36b9e2d249 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
previously allocated by thread T0 here:
    0 0x7f36ba8b83b7 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:77
    1 0x7f36ba4392e4 in qcalloc lib/memory.c:106
    2 0x7f36ba48d0de in prefix_list_new lib/plist.c:150
    3 0x7f36ba48d0de in prefix_list_insert lib/plist.c:186
    4 0x7f36ba48d0de in prefix_list_get lib/plist.c:204
    5 0x7f36ba48f9df in prefix_bgp_orf_set lib/plist.c:1479
    6 0x55eff3f67ba6 in bgp_route_refresh_receive bgpd/bgp_packet.c:2920
    7 0x55eff3f70bab in bgp_process_packet bgpd/bgp_packet.c:4069
    8 0x7f36ba4ec239 in event_call lib/event.c:2019
    9 0x7f36ba41a22a in frr_run lib/libfrr.c:1295
    10 0x55eff3e668b7 in main bgpd/bgp_main.c:557
    11 0x7f36b9e2d249 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

Let's just stop trying to save the pointer around in the peer->orf_plist
data structure.  There are other design problems but at least lets
stop the crash from possibly happening.

Fixes: FRRouting#18138
Signed-off-by: Donald Sharp <[email protected]>