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running fc with negative index segfaults bash

From: Chris King-Parra
Subject: running fc with negative index segfaults bash
Date: Tue, 26 Feb 2019 03:47:16 +0000

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' 
-DCONF_MACHTYPE='x86_64-redhat-linux-gnu' -DCONF_VENDOR='redhat' 
-DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  
-I. -I./include -I./lib  -D_GNU_SOURCE -DRECYCLES_PIDS 
-DDEFAULT_PATH_VALUE='/usr/local/bin:/usr/bin'  -O2 -g -pipe -Wall 
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS 
-fexceptions -fstack-protector-strong -grecord-gcc-switches 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic 
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection 
-Wno-parentheses -Wno-format-security uname output: Linux precision 
4.20.10-200.fc29.x86_64 #1 SMP Fri Feb 15 18:33:14 UTC 2019 x86_64 x86_64 
x86_64 GNU/Linux Machine Type: x86_64-redhat-linux-gnu

Bash Version:   4.4
Patch Level:    23
Release Status: release

    Executing the command "fc -0 -20" causes bash to crash
    and produce the error message '“bash” terminated by 

    signal SIGSEGV (Address boundary error)'.

    Install fedora 29 or openSUSE leap 15. Open an interactive
    bash shell session. Run 'fc -0 -20' in bash and watch it
    crash. To see the error message, run bash from within another
    shell session.

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