Antoine Pitrou created ARROW-2275:

             Summary: [C++] Buffer::mutable_data_ member uninitialized
                 Key: ARROW-2275
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.8.0
            Reporter: Antoine Pitrou

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 

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