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Fix memory leak in typeset (rhbz#1036470)

Browse source 
A memory leak occurred when typeset was used in a function called
from within a command substitution. This fix was backported from
the 93v- beta by Red Hat on 22 Jan 2014. Source:
642af4d6/f/ksh-20120801-memlik3.patch

src/cmd/ksh93/include/name.h,
src/cmd/ksh93/sh/subshell.c:
- Replace the nv_subsaved() function by the version from ksh 93v-.
  This version frees a table from memory if the NV_TABLE flag is
  passed in the new second parameter, a bitmask for flags (which
  was oddly named 'table'; I've renamed it to 'flags').

src/cmd/ksh93/sh/name.c:
- nv_delete(): When calling nv_subsaved(), pass on the NV_TABLE
  flag if given.
- table_unset(): Call nv_delete() with the NV_TABLE flag.

src/cmd/ksh93/tests/leaks.sh:
- Add test based on the reproducer provided in Red Hat bug 1036470.
This commit is contained in:
Martijn Dekker 2020-09-15 23:39:54 +02:00
parent 05683ec75b
commit 461a1aebc1
4 changed files with 37 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/cmd/ksh93/sh/name.c
View file

@ -1259,7 +1259,7 @@ void nv_delete(Namval_t* np, Dt_t *root, int flags)
{
if(dtdelete(root,np))
{
if(!(flags&NV_NOFREE) && ((flags&NV_FUNCTION) || !nv_subsaved(np)))
if(!(flags&NV_NOFREE) && ((flags&NV_FUNCTION) || !nv_subsaved(np,flags&NV_TABLE)))
{
Namarr_t *ap;
if(nv_isarray(np) && np->nvfun && (ap=nv_arrayptr(np)) && array_assoc(ap))
@ -2400,14 +2400,14 @@ static void table_unset(Shell_t *shp, register Dt_t *root, int flags, Dt_t *oroo
{
_nv_unset(nq,flags);
npnext = (Namval_t*)dtnext(root,nq);
nv_delete(nq,root,0);
nv_delete(nq,root,NV_TABLE);
}
}
npnext = (Namval_t*)dtnext(root,np);
if(nv_arrayptr(np))
nv_putsub(np,NIL(char*),ARRAY_SCAN);
_nv_unset(np,flags);
nv_delete(np,root,0);
nv_delete(np,root,NV_TABLE);
}
}