RT #75812: apply get magic before checking flags, PVX

The code was checking flags with applying any get magic, so when a
match was doing putting a numeric string into $1, none of the flags
checked were set, so producing the "non-numeric process ID" error.
(cherry picked from commit 8af710ebc7fee929ae47793d5a0cce5362af52db)

diff --git a/doio.c b/doio.c
index 87f2da0..b439bce 100644 (file)
--- a/doio.c
+++ b/doio.c
@@ -1720,9 +1720,10 @@ nothing in the core.
            while (++mark <= sp) {
                I32 proc;
                register unsigned long int __vmssts;
+               SvGETMAGIC(*mark);
                if (!(SvIOK(*mark) || SvNOK(*mark) || looks_like_number(*mark)))
                    Perl_croak(aTHX_ "Can't kill a non-numeric process ID");
-               proc = SvIV(*mark);
+               proc = SvIV_nomg(*mark);
                APPLY_TAINT_PROPER();
                if (!((__vmssts = sys$delprc(&proc,0)) & 1)) {
                    tot--;
@@ -1746,9 +1747,10 @@ nothing in the core.
            val = -val;
            while (++mark <= sp) {
                I32 proc;
+               SvGETMAGIC(*mark);
                if (!(SvIOK(*mark) || SvNOK(*mark) || looks_like_number(*mark)))
                    Perl_croak(aTHX_ "Can't kill a non-numeric process ID");
-               proc = SvIV(*mark);
+               proc = SvIV_nomg(*mark);
                APPLY_TAINT_PROPER();
 #ifdef HAS_KILLPG
                if (PerlProc_killpg(proc,val))  /* BSD */
@@ -1761,9 +1763,10 @@ nothing in the core.
        else {
            while (++mark <= sp) {
                I32 proc;
+               SvGETMAGIC(*mark);
                if (!(SvIOK(*mark) || SvNOK(*mark) || looks_like_number(*mark)))
                    Perl_croak(aTHX_ "Can't kill a non-numeric process ID");
-               proc = SvIV(*mark);
+               proc = SvIV_nomg(*mark);
                APPLY_TAINT_PROPER();
                if (PerlProc_kill(proc, val))
                    tot--;

diff --git a/t/op/kill0.t b/t/op/kill0.t
index eadf15d..d3ef8f7 100644 (file)
--- a/t/op/kill0.t
+++ b/t/op/kill0.t
@@ -14,7 +14,7 @@ BEGIN {
 
 use strict;
 
-plan tests => 5;
+plan tests => 6;
 
 ok( kill(0, $$), 'kill(0, $pid) returns true if $pid exists' );
 
@@ -43,3 +43,10 @@ for my $case ( @bad_pids ) {
   like( $@, qr/^Can't kill a non-numeric process ID/, "dies killing $name pid");
 }
 
+# Verify that killing a magic variable containing a number doesn't
+# trigger the above
+{
+  my $x = $$ . " ";
+  $x =~ /(\d+)/;
+  ok(eval { kill 0, $1 }, "can kill a number string in a magic variable");
+}