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object.c: fix potential oob write in rb_str_to_dbl()

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Ensure space for the terminating NUL byte. Note that this code path is
reachable only when Ruby is compiled with SHARABLE_MIDDLE_SUBSTRING=1.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59714 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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rhe 2017-09-01 08:16:38 +00:00
parent 99d64640c4
commit fc188f1646
1 changed files with 1 additions and 1 deletions
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object.c
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@ -3302,7 +3302,7 @@ rb_str_to_dbl(VALUE str, int badcheck)
rb_raise(rb_eArgError, "string for Float contains null byte");
}
if (s[len]) { /* no sentinel somehow */
char *p = ALLOCV(v, len);
char *p = ALLOCV(v, (size_t)len + 1);
MEMCPY(p, s, char, len);
p[len] = '\0';
s = p;