bytesobject.c: Possible null pointer dereference due to formatfloat()

[ZackerySpytz]

BPO	34879
Nosy	@serhiy-storchaka, @ZackerySpytz, @miss-islington
PRs	bpo-34879: Fix a possible null pointer dereference in bytesobject.c #9683 [3.7] bpo-34879: Fix a possible null pointer dereference in bytesobject.c (GH-9683) #9684 [3.6] bpo-34879: Fix a possible null pointer dereference in bytesobject.c (GH-9683) #9685

^{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 2018-10-03.06:35:31.683>
created_at = <Date 2018-10-03.04:53:44.613>
labels = ['interpreter-core', '3.7', '3.8', 'type-crash']
title = 'bytesobject.c: Possible null pointer dereference due to formatfloat()'
updated_at = <Date 2018-10-03.06:35:31.683>
user = 'https://github.com/ZackerySpytz'

bugs.python.org fields:

activity = <Date 2018-10-03.06:35:31.683>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-03.06:35:31.683>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2018-10-03.04:53:44.613>
creator = 'ZackerySpytz'
dependencies = []
files = []
hgrepos = []
issue_num = 34879
keywords = ['patch']
message_count = 5.0
messages = ['326933', '326938', '326939', '326940', '326941']
nosy_count = 3.0
nosy_names = ['serhiy.storchaka', 'ZackerySpytz', 'miss-islington']
pr_nums = ['9683', '9684', '9685']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue34879'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[ZackerySpytz]

The PyBytes_FromStringAndSize() call in formatfloat() is not checked for failure.

[serhiy-storchaka]

New changeset 96c5932 by Serhiy Storchaka (Zackery Spytz) in branch 'master':
bpo-34879: Fix a possible null pointer dereference in bytesobject.c (GH-9683)
96c5932

[serhiy-storchaka]

Thank you for your report and fix Zackery.

[miss-islington]

New changeset 063755c by Miss Islington (bot) in branch '3.7':
bpo-34879: Fix a possible null pointer dereference in bytesobject.c (GH-9683)
063755c

[miss-islington]

New changeset 6580e52 by Miss Islington (bot) in branch '3.6':
bpo-34879: Fix a possible null pointer dereference in bytesobject.c (GH-9683)
6580e52