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Null pointer dereference in mrb_str_modify #3407

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clayton-shopify opened this Issue Jan 21, 2017 · 0 comments

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clayton-shopify commented Jan 21, 2017

The following input demonstrates a crash:

a = String.new
a[0]
GC.start
a.upcase!

The crash occurs at this line, where s->as.heap.len is NULL:

RSTR_PTR(s)[s->as.heap.len] = '\0';

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

@matz matz closed this in 708088c Jan 23, 2017

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