[Bug 1827499] [NEW] bash uninitialized memory access

[Nick Cleaton]

Public bug reported:

The following gives an error message that suggests that bash is reading
from uninitialized memory:

bash -c 'foo() { declare -n bar=baz; declare -A bar; bar[x]=y; }; foo'
environment: line 0: `�d�K�U': not a valid identifier

The short string of garbled characters is different on each run.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: bash 4.4.18-2ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
Uname: Linux 4.15.0-47-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri May  3 11:07:11 2019
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: bash
UpgradeStatus: Upgraded to bionic on 2019-04-02 (30 days ago)

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1827499

Title:
  bash uninitialized memory access

Status in bash package in Ubuntu:
  New

Bug description:
  The following gives an error message that suggests that bash is
  reading from uninitialized memory:

  bash -c 'foo() { declare -n bar=baz; declare -A bar; bar[x]=y; }; foo'
  environment: line 0: `�d�K�U': not a valid identifier

  The short string of garbled characters is different on each run.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bash 4.4.18-2ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May  3 11:07:11 2019
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: bash
  UpgradeStatus: Upgraded to bionic on 2019-04-02 (30 days ago)

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