Hi,
when systemd is compiled with --enable-address-sanitizer, $subject happens:
$ build/test-dhcp6-client
Assertion 'interface_index >= -1' failed at
../src/libsystemd-network/sd-dhcp6-client.c:129, function
sd_dhcp6_client_set_index(). Ignoring.
=================================================================
==29135==ERROR: AddressSanitizer: global-buffer-overflow on address
0x7fe204aa9148 at pc 0x7fe204a5958f bp 0x7fff3e47d470 sp 0x7fff3e47d460
READ of size 1 at 0x7fe204aa9148 thread T0
#0 0x7fe204a5958e in option_parse_hdr
../src/libsystemd-network/dhcp6-option.c:145
#1 0x7fe204a59884 in dhcp6_option_parse
../src/libsystemd-network/dhcp6-option.c:165
#2 0x7fe204a4eb9c in test_advertise_option
../src/libsystemd-network/test-dhcp6-client.c:227
#3 0x7fe204a51c58 in main ../src/libsystemd-network/test-dhcp6-client.c:584
#4 0x7fe2031590df in __libc_start_main (/lib64/libc.so.6+0x200df)
#5 0x7fe204a4cc5b (/home/test/systemd/build/test-dhcp6-client+0x25c5b)
0x7fe204aa9148 is located 2 bytes to the right of global variable
'msg_advertise' from '../src/libsystemd-network/test-dhcp6-client.c'
(0x7fe204aa9080) of size 198
0x7fe204aa9148 is located 56 bytes to the left of global variable 'msg_reply'
from '../src/libsystemd-network/test-dhcp6-client.c' (0x7fe204aa9180) of size
173
SUMMARY: AddressSanitizer: global-buffer-overflow
../src/libsystemd-network/dhcp6-option.c:145 option_parse_hdr
Shadow bytes around the buggy address:
0x0ffcc094d1d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d1e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d1f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d200: 06 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
0x0ffcc094d210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ffcc094d220: 00 00 00 00 00 00 00 00 06[f9]f9 f9 f9 f9 f9 f9
0x0ffcc094d230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d240: 00 00 00 00 00 05 f9 f9 f9 f9 f9 f9 00 00 00 00
0x0ffcc094d250: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d260: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc094d270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Contiguous container OOB:fc
ASan internal: fe
==29135==ABORTING
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