running fc with negative index segfaults bash

[Chris King-Parra]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' 
-DCONF_HOSTTYPE='x86_64'-DCONF_OSTYPE='linux-gnu' 
-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-hardened-cc1 
-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

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

    signal SIGSEGV (Address boundary error)'.

Repeat-By:
    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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