wengzhe opened a new pull request, #8785:
URL: https://github.com/apache/nuttx/pull/8785
## Summary
Fix following misaligned errors:
```
icmpv6/icmpv6_radvertise.c:145:21: runtime error: member access within
misaligned address 0x573da9e6 for type 'struct icmpv6_router_advertise_s',
which requires 4 byte alignment
0x573da9e6: note: pointer points here
00 00 00 01 85 00 d6 14 00 00 00 00 01 01 12 8c 25 08 9c f8 04 00 00 00
ff 02 00 00 00 00 00 00
^
icmpv6/icmpv6_radvertise.c:167:21: runtime error: member access within
misaligned address 0x573da9fe for type 'struct icmpv6_mtu_s', which requires 4
byte alignment
0x573da9fe: note: pointer points here
af 78 ab 72 00 00 00 00 00 00 00 01 ff 00 00 01 04 00 00 00 ff 02 00 00
00 00 00 00 00 00 00 01
^
icmpv6/icmpv6_radvertise.c:176:23: runtime error: member access within
misaligned address 0x573daa06 for type 'struct icmpv6_prefixinfo_s', which
requires 4 byte alignment
0x573daa06: note: pointer points here
00 00 05 dc ff 00 00 01 04 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 01
ff 08 9c f8 04 00 00 00
^
```
This was first introduced by d0f72617, but our network data is normally
aligned to 2 bytes (such as ipaddr in ipv4_hdr_s) and cannot be assumed to be
aligned by 4.
## Impact
Align icmpv6 structs to 2 bytes.
## Testing
Manually & CI
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