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Avoid crashing of Array#unshift; fix #4808

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On cases like `a.unshift(*a)`.
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Yukihiro "Matz" Matsumoto
2019-11-08 10:57:18 +09:00
parent 962776fe25
commit 8ff001ef30
1 changed files with 2 additions and 0 deletions
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src/array.c
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@@ -631,11 +631,13 @@ mrb_ary_unshift_m(mrb_state *mrb, mrb_value self)
ptr = a->as.heap.ptr;
}
else {
mrb_bool same = vals == ARY_PTR(a);
ary_modify(mrb, a);
if (ARY_CAPA(a) < len + alen)
ary_expand_capa(mrb, a, len + alen);
ptr = ARY_PTR(a);
value_move(ptr + alen, ptr, len);
if (same) vals = ptr;
}
array_copy(ptr, vals, alen);
ARY_SET_LEN(a, len+alen);