ASF GitHub Bot commented on ARROW-2275:

pitrou opened a new pull request #1717: ARROW-2275: [C++] Guard against bad use 
of Buffer.mutable_data()
URL: https://github.com/apache/arrow/pull/1717

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> [C++] Buffer::mutable_data_ member uninitialized
> ------------------------------------------------
>                 Key: ARROW-2275
>                 URL: https://issues.apache.org/jira/browse/ARROW-2275
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.8.0
>            Reporter: Antoine Pitrou
>            Priority: Minor
>              Labels: pull-request-available
> For immutable buffers (i.e. most of them), the {{mutable_data_}} member is 
> uninitialized. If the user calls {{mutable_data()}} by mistake on such a 
> buffer, they will get a bogus pointer back.
> This is exacerbated by the Tensor API whose const and non-const 
> {{raw_data()}} methods return different things...
> (also an idea: add a DCHECK for mutability before returning from 
> {{mutable_data()}}?)

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