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Integer overflow in mrb_ary_set #3353

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clayton-shopify opened this issue Dec 19, 2016 · 0 comments
Closed

Integer overflow in mrb_ary_set #3353

clayton-shopify opened this issue Dec 19, 2016 · 0 comments

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@clayton-shopify
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@clayton-shopify clayton-shopify commented Dec 19, 2016

The following input crashes MRuby:

(Array.new)[0x7fffffff] = 1

It appears the bug is here, where n+1 overflows:

ary_expand_capa(mrb, a, n + 1);

This issue was reported by https://hackerone.com/tunz

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