[Impala-ASF-CR] IMPALA-5123: Fix ASAN use after free in timezone db

["Zach Amsden (Code Review)" <ge...@cloudera.org>]

Zach Amsden has uploaded a new patch set (#2).

Change subject: IMPALA-5123: Fix ASAN use after free in timezone_db
......................................................................

IMPALA-5123: Fix ASAN use after free in timezone_db

The issue is that the string temporary returned by .string goes
out of scope immediately after being created.  Also, the API
to mkstemp is unclear on whether it modifies the string in place.
Just strdup() the c_str() to be safe - this is not performance
critical code.

Testing: ASAN build, running expr-test be test; ASAN fails before,
passes after this change.

Change-Id: I490f741403ea2004bc51394aa1251577337b1e1d
---
M be/src/exprs/timezone_db.cc
1 file changed, 3 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/03/6503/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I490f741403ea2004bc51394aa1251577337b1e1d
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Zach Amsden <za...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Jim Apple <jb...@apache.org>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>