[jira] [Created] (IMPALA-11365) Dereferencing null pointer in TopNNode

["Daniel Becker (Jira)" <ji...@apache.org>]

Daniel Becker created IMPALA-11365:
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             Summary: Dereferencing null pointer in TopNNode
                 Key: IMPALA-11365
                 URL: https://issues.apache.org/jira/browse/IMPALA-11365
             Project: IMPALA
          Issue Type: Bug
            Reporter: Daniel Becker
            Assignee: Daniel Becker


In the constructor of TopNNode, if {{pnode.partition_comparator_config_}} is NULL, we initialise {{partition_cmp_}} with a NULL pointer. However, when initialising {{{}partition_heaps_{}}}, we dereference {{partition_cmp_}} because {{ComparatorWrapper}} expects a reference.

This has so far not lead to a crash because in this case the comparator of {{partition_heaps_}} is not used, but assigning a NULL pointer to a reference is undefined behaviour.



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