[2.7] Possible crashes due to incorrect error handling in pyexpat.c

[ZackerySpytz]

BPO	35068
Nosy	@serhiy-storchaka, @ZackerySpytz
PRs	[2.7] bpo-35068: Fix possible crashes in pyexpat.c #10099

^{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 2018-10-29.07:24:16.855>
created_at = <Date 2018-10-25.16:58:45.784>
labels = ['extension-modules', 'type-crash']
title = '[2.7] Possible crashes due to incorrect error handling in pyexpat.c'
updated_at = <Date 2018-10-29.07:24:16.854>
user = 'https://github.com/ZackerySpytz'

bugs.python.org fields:

activity = <Date 2018-10-29.07:24:16.854>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-29.07:24:16.855>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2018-10-25.16:58:45.784>
creator = 'ZackerySpytz'
dependencies = []
files = []
hgrepos = []
issue_num = 35068
keywords = ['patch']
message_count = 2.0
messages = ['328455', '328793']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'ZackerySpytz']
pr_nums = ['10099']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue35068'
versions = ['Python 2.7']

[ZackerySpytz]

The attached PR fixes several error handling bugs in pyexpat.c.

[serhiy-storchaka]

New changeset d61f586 by Serhiy Storchaka (Zackery Spytz) in branch '2.7':
[2.7] bpo-35068: Fix possible crashes in pyexpat.c. (GH-10099)
d61f586