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https://issues.apache.org/jira/browse/CASSANDRA-15373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16961057#comment-16961057
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Benedict Elliott Smith commented on CASSANDRA-15373:
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I think there's one remaining missing check: in {{decodeCellName}} we need to
verify that the {{collectionElement}} is valid, as it can be a fixed width type.
> validate value sizes in LegacyLayout
> ------------------------------------
>
> Key: CASSANDRA-15373
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15373
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Normal
> Fix For: 3.0.19, 3.11.5, 4.0
>
>
> In 2.1, all values are serialized as variable length blobs, with a length
> prefix, followed by the actual value, even with fixed width types like int32.
> The 3.0 storage engine, on the other hand, omits the length prefix for fixed
> width types. Since the length of fixed width types are not validated on the
> 3.0 write path, writing data for a fixed width type from an incorrectly sized
> byte buffer will over or underflow the space allocated for it, corrupting the
> remainder of that partition or indexed region from being read. This is not
> discovered until we attempt to read the corrupted value. This patch updates
> LegacyLayout to throw a marshal exception if it encounters an unexpected
> value size for fixed size columns.
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