‘memset’ offset [17, 88] from the object at ‘addrbuf’ is out of the bounds of referenced subobject

[pablogsal]

BPO	38455
Nosy	@vstinner, @tiran, @ambv, @pablogsal

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-10-12.19:18:52.849>
created_at = <Date 2019-10-12.19:11:40.302>
labels = ['3.8']
title = '\xe2\x80\x98memset\xe2\x80\x99 offset [17, 88] from the object at \xe2\x80\x98addrbuf\xe2\x80\x99 is out of the bounds of referenced subobject'
updated_at = <Date 2019-10-12.19:18:52.848>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2019-10-12.19:18:52.848>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2019-10-12.19:18:52.849>
closer = 'pablogsal'
components = []
creation = <Date 2019-10-12.19:11:40.302>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 38455
keywords = []
message_count = 2.0
messages = ['354547', '354549']
nosy_count = 4.0
nosy_names = ['vstinner', 'christian.heimes', 'lukasz.langa', 'pablogsal']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38455'
versions = ['Python 3.8']

[pablogsal]

Compiling 3.8 in release mode emits this warning:

In function ‘getsockaddrarg’,
inlined from ‘sock_bind’ at /home/pablogsal/github/python/3.8/Modules/socketmodule.c:3066:10:
/home/pablogsal/github/python/3.8/Modules/socketmodule.c:2288:9: warning: ‘memset’ offset [17, 88] from the object at ‘addrbuf’ is out of the bounds of referenced subobject ‘sa’ with type ‘struct sockaddr’ at offset 0 [-Warray-bounds]
2288 | memset(sa, 0, sizeof(*sa));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~

[pablogsal]

Duplicate of https://bugs.python.org/issue38282