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Correct memory fault when removing default nameref KSH_VERSION (#271)

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This commit fixes a segmentation fault when an attempt was made to
unset the default KSH_VERSION variable prior any other nameref
activity such as creating another nameref or even reassigning the
nameref KSH_VERSION to something else.

(new shell without prior nameref activity)
$ nameref
KSH_VERSION=.sh.version
$ unset -n KSH_VERSION
Memory fault

src/cmd/ksh93/sh/name.c: _nv_unset():
- Add a 'Refdict' check before attempting to remove a value from it
  as apparently one does not exist until some sort of nameref
  activity occurs after shell startup as the default nameref of
  'KSH_VERSION=.sh.version' does not create one.
This commit is contained in:
hyenias 2021-04-12 22:15:34 -04:00 • committed by GitHub
parent 75796a9c75
commit d6ddd89053
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 11 additions and 2 deletions
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6
NEWS
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@ -3,6 +3,12 @@ For full details, see the git log at: https://github.com/ksh93/ksh
Any uppercase BUG_* names are modernish shell bug IDs.
2021-04-12:
- Corrected a memory fault when an attempt was made to unset the default
nameref KSH_VERSION from the shell environment prior to any other name
reference variable creation or modificaton.
2021-04-11:
- Fixed two related regressions introduced on 2020-06-16:

2
src/cmd/ksh93/include/version.h
View file

@ -20,7 +20,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-alpha" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2021-04-11" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-04-12" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */

2
src/cmd/ksh93/sh/name.c
View file

@ -2578,7 +2578,7 @@ void _nv_unset(register Namval_t *np,int flags)
else if(nv_isref(np) && !nv_isattr(np,NV_EXPORT|NV_MINIMAL) && np->nvalue.nrp)
{
if(np->nvalue.nrp->root)
if(np->nvalue.nrp->root && Refdict)
dtdelete(Refdict,(void*)np->nvalue.nrp);
if(np->nvalue.nrp->sub)
free(np->nvalue.nrp->sub);

3
src/cmd/ksh93/tests/nameref.sh
View file

@ -684,4 +684,7 @@ typeset -n ref='arr[2]'
$SHELL 2> /dev/null -c 'function x { nameref lv=gg ; compound -A lv.c=( [4]=( x=1 )) ; } ; compound gg ; x' || err_exit 'compound array assignment with nameref in a function failed'
$SHELL -c 'unset -n KSH_VERSION' 2> /dev/null || err_exit 'Unable to unset nameref KSH_VERSION.'
# ======
exit $((Errors<125?Errors:125))