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https://issues.apache.org/jira/browse/AVRO-1237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Douglas Creager updated AVRO-1237:
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Attachment: 0001-AVRO-1237.-C-Verify-union-discriminant-when-reading-.patch
Here is a patch that performs the bounds check in the file-reading code. Turns
out it wasn't as horrible as I thought. This patch means that we call
avro_value_get_schema every time we read in a union value, but that function is
really quick since it returns an existing schema instance in most cases.
> Avro-C segfaults when union discriminant out of bounds
> ------------------------------------------------------
>
> Key: AVRO-1237
> URL: https://issues.apache.org/jira/browse/AVRO-1237
> Project: Avro
> Issue Type: Bug
> Components: c
> Environment: Avro-C 1.7.2
> Ubuntu 12.04 x86_64
> Reporter: Michael Cooper
> Attachments:
> 0001-AVRO-1237.-C-Verify-union-discriminant-when-reading-.patch,
> 0001-Check-union-discriminant-bounds-in-both-directions.patch,
> 0001-Test-case-for-AVRO-1237.patch, avro-1237-bad-union-discriminant.avro,
> avro-1237-good.avro
>
>
> libavro will segfault when decrypting a specially crafted (or corrupted) avro
> file when the discriminant is out of bounds.
> There is already a check for < 0, but there is no upper bounds check.
> I have attached a patch that checks the bounds.
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