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bc: forbid negative array index #521

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merged 1 commit into from
Mar 25, 2024
Merged

bc: forbid negative array index #521

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14 changes: 9 additions & 5 deletions bin/bc
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Original file line number Diff line number Diff line change
Expand Up @@ -2459,10 +2459,14 @@ sub exec_stmt
next INSTR;

} elsif($_ eq 'P') {

my $value = pop @ope_stack;
my $index = pop @ope_stack;
push @ope_stack, $value;
my $index = splice @ope_stack, -2, 1; # rval remains top of stack
if($index !~ /^\d+$/) {
print STDERR "Non-integer index $index for array\n";
$return = 3;
@ope_stack = ();
@stmt_list=();
last INSTR;
}
push @ope_stack, $instr->[1] . '[]' . $index;
next INSTR;

Expand All @@ -2489,7 +2493,7 @@ sub exec_stmt
$return = 3;
@ope_stack = ();
@stmt_list=();
YYERROR;
last INSTR;
}

# debug {"p: $name, $idx.\n"};
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