When attaching a vrf to a bridge vlan interface on a bridge with no port
interfaces attached, the vrf code will call cnetlink:search_fdb, which
will then try to access the still unset bridge, causing a segfault.
To avoid this, let cnetlink::search_fdb handle this and just return an
empty deque in this case.
Stacktrace showing the issue:
Program terminated with signal SIGSEGV, Segmentation fault.
0 0x000055ad93b0909d in basebox::cnetlink::search_fdb (this=0x55ad950dcda0, vid=vid@entry=30, lladdr=lladdr@entry=0x0) at ../git/src/netlink/cnetlink.cc:1666
0 0x000055ad93b0909d in basebox::cnetlink::search_fdb (this=0x55ad950dcda0, vid=vid@entry=30, lladdr=lladdr@entry=0x0) at ../git/src/netlink/cnetlink.cc:1666
1 0x000055ad93b3427b in basebox::nl_vlan::vrf_attach (this=0x55ad950db930, old_link=old_link@entry=0x7f7f54002540, new_link=new_link@entry=0x7f7f54001210) at ../git/src/netlink/nl_vlan.cc:384
2 0x000055ad93b06451 in basebox::cnetlink::link_updated (this=0x55ad950dcda0, old_link=0x7f7f54002540, new_link=0x7f7f54001210) at /usr/include/c++/9.3.0/bits/shared_ptr_base.h:1020
3 0x000055ad93b0a81a in basebox::cnetlink::route_link_apply (this=0x55ad950dcda0, obj=...) at ../git/src/netlink/nl_obj.h:27
4 0x000055ad93b0c8c7 in basebox::cnetlink::handle_wakeup (this=0x55ad950dcda0, thread=...) at ../git/src/netlink/cnetlink.cc:766
5 0x00007f7f5cac45d4 in rofl::cthread::handle_wakeup() () from /usr/lib/librofl_common.so.0
6 0x00007f7f5cac52b5 in rofl::cthread::run_loop() () from /usr/lib/librofl_common.so.0
7 0x00007f7f5c1daea4 in ?? () from /lib/libpthread.so.0
8 0x00007f7f5c10ddcf in clone () from /lib/libc.so.6
When attaching a vrf to a bridge vlan interface on a bridge with no port interfaces attached, the vrf code will call cnetlink:search_fdb, which will then try to access the still unset bridge, causing a segfault.
To avoid this, let cnetlink::search_fdb handle this and just return an empty deque in this case.
Stacktrace showing the issue:
Signed-off-by: Jonas Gorski jonas.gorski@bisdn.de