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string.c: fix integer overflow

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* string.c (str_byte_substr): fix another integer overflow which
  can happen only when SHARABLE_MIDDLE_SUBSTRING is enabled.
  [ruby-core:79951] [Bug #13289]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57799 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-03-07 09:07:57 +00:00
parent d19d629eaa
commit f4d13801b6
1 changed files with 1 additions and 1 deletions
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string.c
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@ -5254,7 +5254,7 @@ str_byte_substr(VALUE str, long beg, long len, int empty)
beg += n; beg += n;
if (beg < 0) return Qnil; if (beg < 0) return Qnil;
} }
if (beg + len > n) if (len > n - beg)
len = n - beg; len = n - beg;
if (len <= 0) { if (len <= 0) {
if (!empty) return Qnil; if (!empty) return Qnil;