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[PATCH: bash-5.0.0(2)-alpha] fix a bug that "bind -r" sometimes causes a


From: Koichi Murase
Subject: [PATCH: bash-5.0.0(2)-alpha] fix a bug that "bind -r" sometimes causes a segmentation fault
Date: Mon, 19 Mar 2018 17:52:02 +0900

Bash Version:

  I used the following latest commit from the devel branch.

  commit bf5b8103d466fdbc3bfcdaa5e21a0d0c0dce7cba
  Author: Chet Ramey <address@hidden>
  Date:   Mon Mar 12 08:10:29 2018 -0400

      commit bash-20180309 snapshot

Description:

  At the line lib/readline/bind.c:376, an uninitialized variable `ic'
is used to assign a value to the variable `prevkey'. This assignment
to `prevkey' should be later than the assignment to `ic'. This causes
segmentation faults in Bash of the devel branch. There is no such
problem in Bash 4.4.

Repeat-By:

  I noticed this bug in the following reduced case causing the
segmentation fault, but it should depend on environments because
accessing uninitialized variables generally results in undefined
behavior.

  $ bash-5.0.0 --norc
  $ bind -r '\C-j'
  $ bind -r `\C-m`
  Segmentation fault

Fix:

  I attach a patch file.

Attachment: 0001-fix-a-bug-that-bind-r-sometimes-causes-a-segmentatio.patch
Description: Binary data


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