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https://issues.apache.org/jira/browse/AVRO-1237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851723#comment-13851723
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ASF subversion and git services commented on AVRO-1237:
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Commit 1551941 from dcrea...@apache.org in branch 'avro/trunk'
[ https://svn.apache.org/r1551941 ]
AVRO-1237. C: Verify union discriminant when reading Avro data files.
Test case submitted by Michael Cooper. Michael's original fix was to
perform a bounds check in avro_value_set_branch, but I've opted for a
solution in avro_value_read. This has two benefits: the check is only
performed when reading a discriminant value from an unsafe source, and
it doesn't impose an extra burden on anyone writing their own custom
value implementations.
> 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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