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vm_insnhelper.c: avoid nevative sp

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space_size can be zero here, under the following script.  We would
better bail out before bptr calculation.

% ./miniruby --dump=i -e '* = nil'
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,7)> (catch: FALSE)
0000 putnil                                                           (   1)[Li]
0001 dup
0002 expandarray                  0, 0
0005 leave


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65685 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2018-11-12 08:14:09 +00:00
parent 5a10e835ae
commit 3208db7fb3
1 changed files with 4 additions and 1 deletions
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5
vm_insnhelper.c
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@ -1269,7 +1269,10 @@ vm_expandarray(VALUE *sp, VALUE ary, rb_num_t num, int flag)
len = (rb_num_t)RARRAY_LEN(ary);
}
if (flag & 0x02) {
if (space_size == 0) {
/* no space left on stack */
}
else if (flag & 0x02) {
/* post: ..., nil ,ary[-1], ..., ary[0..-num] # top */
rb_num_t i = 0, j;