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string.c: fix integer overflow

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* string.c (rb_str_subpos): fix integer overflow which can happen
  only when SHARABLE_MIDDLE_SUBSTRING is enabled.  incorpolate
  https://github.com/mruby/mruby/commit/7db0786abdd243ba031e24683f

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57797 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-03-07 05:48:15 +00:00
parent a298301baa
commit 72f8df158f
1 changed files with 1 additions and 1 deletions
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2
string.c
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@ -2386,7 +2386,7 @@ rb_str_subpos(VALUE str, long beg, long *lenp)
beg += blen; beg += blen;
if (beg < 0) return 0; if (beg < 0) return 0;
} }
if (beg + len > blen) if (len > blen - beg)
len = blen - beg; len = blen - beg;
if (len < 0) return 0; if (len < 0) return 0;
p = s + beg; p = s + beg;