SIGSEGV: rl_redisplay: Long Directory Name with EM Dash character in Graphical Terminal

[Kieran Grant]

Hi All,

Found an interesting bug today,

GNU bash, version 4.4.18(4)-release (x86_64-unknown-linux-gnu)

When running in a graphical terminal (xterm, mate-terminal, gnome-terminal) set 
to 80x24.
I get a SIGSEGV in rl_redisplay doing the following: (Haven't managed to do it 
on a Virtual Console)

mkdir 
/tmp/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX–XXXXX
cd 
/tmp/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX–XXXXX

NOTE: That is an EN Dash, not a hyphen.

Building from git (CFLAGS=-g ./configure --enable-static-link) run under gdb in 
such a terminal:
$ gdb ./bash
GNU gdb (Ubuntu 8.0.1-0ubuntu1) 8.0.1
...
(gdb) run
$ mkdir 
/tmp/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX–XXXXX
$ cd 
/tmp/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX–XXXXX

Program received signal SIGSEGV, Segmentation fault.
0x00000000004bd03b in rl_redisplay () at display.c:823
823           inv_lbreaks[++newlines] = temp;
(gdb) bt
#0  0x00000000004bd03b in rl_redisplay () at display.c:823
#1  0x00000000004a858c in readline_internal_setup () at readline.c:443
#2  0x00000000004a8a1f in readline_internal () at readline.c:669
#3  0x00000000004a8452 in readline (prompt=0x872208 "j\001") at readline.c:376
#4  0x0000000000407987 in yy_readline_get () at 
/usr/homes/chet/src/bash/src/parse.y:1456
#5  0x0000000000407a9c in yy_readline_get () at 
/usr/homes/chet/src/bash/src/parse.y:1487
#6  0x00000000004078d2 in yy_getc () at 
/usr/homes/chet/src/bash/src/parse.y:1390
#7  0x00000000004087c6 in shell_getc (remove_quoted_newline=1) at 
/usr/homes/chet/src/bash/src/parse.y:2299
#8  0x0000000000409d31 in read_token (command=0) at 
/usr/homes/chet/src/bash/src/parse.y:3115
#9  0x00000000004092c9 in yylex () at /usr/homes/chet/src/bash/src/parse.y:2675
#10 0x0000000000404425 in yyparse () at y.tab.c:1834
#11 0x0000000000403fd8 in parse_command () at eval.c:261
#12 0x00000000004040be in read_command () at eval.c:305
#13 0x0000000000403cee in reader_loop () at eval.c:149
#14 0x00000000004017c6 in main (argc=1, argv=0x7fffffffddc8, 
env=0x7fffffffddd8) at shell.c:792

My host is Ubuntu 17.10, 64-bit Ubuntu shipped kernel 4.13.0-32-generic.

Regards,
Kieran