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List:       oss-security
Subject:    [oss-security] libass ass_outline.c signed integer overflow
From:       Fstark <f734222792 () gmail ! com>
Date:       2020-09-29 0:19:19
Message-ID: CAEFBov0z-zr4q=_srb3q7gq1-f1P6GBf78p8GYUj0DvsXVKLTw () mail ! gmail ! com
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In `ass_outline_construct`'s call to `outline_stroke` a signed integer
overflow happens *(undefined behaviour)*. On my machine signed overflow
happens to wrap around to a negative value, thus failing the assert.
https://github.com/libass/libass/issues/431

https://github.com/libass/libass/pull/432


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