package/utils/busybox/patches/001-CVE-2022-30065-awk-fix-use-after-free.patch

   1 From e63d7cdfdac78c6fd27e9e63150335767592b85e Mon Sep 17 00:00:00 2001
   2 From: Natanael Copa <ncopa@alpinelinux.org>
   3 Date: Fri, 17 Jun 2022 17:45:34 +0200
   4 Subject: awk: fix use after free (CVE-2022-30065)
   5
   6 fixes https://bugs.busybox.net/show_bug.cgi?id=14781
   7
   8 function                                             old     new   delta
   9 evaluate                                            3343    3357     +14
  10
  11 Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
  12 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
  13 ---
  14  editors/awk.c       | 3 +++
  15  testsuite/awk.tests | 6 ++++++
  16  2 files changed, 9 insertions(+)
  17
  18 --- a/editors/awk.c
  19 +++ b/editors/awk.c
  20 @@ -3114,6 +3114,9 @@ static var *evaluate(node *op, var *res)
  21
  22                 case XC( OC_MOVE ):
  23                         debug_printf_eval("MOVE\n");
  24 +                       /* make sure that we never return a temp var */
  25 +                       if (L.v == TMPVAR0)
  26 +                               L.v = res;
  27                         /* if source is a temporary string, jusk relink it to dest */
  28                         if (R.v == TMPVAR1
  29                          && !(R.v->type & VF_NUMBER)
  30 --- a/testsuite/awk.tests
  31 +++ b/testsuite/awk.tests
  32 @@ -469,4 +469,10 @@ testing 'awk printf %% prints one %' \
  33         "%\n" \
  34         '' ''
  35
  36 +testing 'awk assign while test' \
  37 +       "awk '\$1==\$1=\"foo\" {print \$1}'" \
  38 +       "foo\n" \
  39 +       "" \
  40 +       "foo"
  41 +
  42  exit $FAILCOUNT