Undefined behavior in Parser/parsetok.c

[ZackerySpytz]

BPO	34400
Nosy	@benjaminp, @serhiy-storchaka, @ZackerySpytz, @miss-islington
PRs	bpo-34400: Fix undefined behavior in parsetok() #4439 [3.7] closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439) #8768 [3.6] closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439) #8769 [2.7] closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439) #8770 bpo-34400: Fix more undefined behavior in parsetok.c #8833 [3.7] bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833) #8842 [3.6] bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833) #8843 [2.7] bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833). #8849

^{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 2018-08-15.06:27:29.098>
created_at = <Date 2018-08-14.09:46:55.514>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7']
title = 'Undefined behavior in Parser/parsetok.c'
updated_at = <Date 2018-08-22.05:54:21.764>
user = 'https://github.com/ZackerySpytz'

bugs.python.org fields:

activity = <Date 2018-08-22.05:54:21.764>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-08-15.06:27:29.098>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2018-08-14.09:46:55.514>
creator = 'ZackerySpytz'
dependencies = []
files = []
hgrepos = []
issue_num = 34400
keywords = ['patch']
message_count = 9.0
messages = ['323505', '323548', '323549', '323551', '323553', '323813', '323814', '323815', '323863']
nosy_count = 4.0
nosy_names = ['benjamin.peterson', 'serhiy.storchaka', 'ZackerySpytz', 'miss-islington']
pr_nums = ['4439', '8768', '8769', '8770', '8833', '8842', '8843', '8849']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34400'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[ZackerySpytz]

In parsetok(), null pointers are used in pointer arithmetic.

[benjaminp]

New changeset 7c4ab2a by Benjamin Peterson (Zackery Spytz) in branch 'master':
closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439)
7c4ab2a

[miss-islington]

New changeset 2275b77 by Miss Islington (bot) in branch '3.7':
closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439)
2275b77

[miss-islington]

New changeset 00aebab by Miss Islington (bot) in branch '2.7':
closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439)
00aebab

[miss-islington]

New changeset 981aa46 by Miss Islington (bot) in branch '3.6':
closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439)
981aa46

[benjaminp]

New changeset 3e26e42 by Benjamin Peterson (Zackery Spytz) in branch 'master':
bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833)
3e26e42

[miss-islington]

New changeset 985dcd4 by Miss Islington (bot) in branch '3.7':
bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833)
985dcd4

[miss-islington]

New changeset e496b2b by Miss Islington (bot) in branch '3.6':
bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833)
e496b2b

[serhiy-storchaka]

New changeset eb9a1c0 by Serhiy Storchaka (Zackery Spytz) in branch '2.7':
[2.7] bpo-34400: Fix more undefined behavior in parsetok.c (GH-8833). (GH-8849)
eb9a1c0