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Disallow deleting SYMTAB and its elements (#43)

This commit is contained in:
Cody Mello 2019-06-17 10:08:54 -09:00 committed by Arnold Robbins
parent fabf9efece
commit ae99b752af
4 changed files with 10 additions and 1 deletions
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5
FIXES
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@ -25,6 +25,11 @@ THIS SOFTWARE.
This file lists all bug fixes, changes, etc., made since the AWK book
was sent to the printers in August, 1987.
June 17, 2019:
Disallow deleting SYMTAB and its elements, which creates
use-after-free bugs. Thanks to GitHub user Cody Mello (melloc)
for the fix. (Merged from PR #43.)
June 5, 2019:
Allow unmatched right parenthesis in a regular expression to
be treated literally. Fixes Issue #40. Thanks to GitHub user

1
awk.h
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@ -105,6 +105,7 @@ extern Cell *rsloc; /* RS */
extern Cell *rstartloc; /* RSTART */
extern Cell *rlengthloc; /* RLENGTH */
extern Cell *subseploc; /* SUBSEP */
extern Cell *symtabloc; /* SYMTAB */
/* Cell.tval values: */
#define NUM 01 /* number value is valid */

2
main.c
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@ -22,7 +22,7 @@ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
****************************************************************/
const char *version = "version 20190605";
const char *version = "version 20190617";
#define DEBUG
#include <stdio.h>

3
run.c
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@ -512,6 +512,9 @@ Cell *awkdelete(Node **a, int n) /* a[0] is symtab, a[1] is list of subscripts *
int nsub;
x = execute(a[0]); /* Cell* for symbol table */
if (x == symtabloc) {
FATAL("cannot delete SYMTAB or its elements");
}
if (!isarr(x))
return True;
if (a[1] == 0) { /* delete the elements, not the table */