[SERVER-57782] Coverity analysis defect 120189: Uninitialized scalar variable Created: 17/Jun/21  Updated: 29/Oct/23  Resolved: 14/Jul/21

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 5.1.0-rc0

Type: Bug Priority: Major - P3
Reporter: Coverity Collector User Assignee: Louis Williams
Resolution: Fixed Votes: 0
Labels: coverity
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Backwards Compatibility: Fully Compatible
Operating System: ALL
Sprint: Execution Team 2021-07-12, Execution Team 2021-07-26
Participants:

 Description   

Uninitialized scalar variable

The variable will contain an arbitrary value left from earlier computations. Use of an uninitialized variable
/src/mongo/db/storage/ephemeral_for_test/ephemeral_for_test_sorted_impl.cpp:1282: UNINIT 120189 Declaring variable "data".



 Comments   
Comment by Vivian Ge (Inactive) [ 06/Oct/21 ]

Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it’s been triggered. For more active release information, please keep an eye on #server-release. Thank you!

Comment by Githook User [ 14/Jul/21 ]

Author:

{'name': 'Louis Williams', 'email': 'louis.williams@mongodb.com', 'username': 'louiswilliams'}

Message: SERVER-57782 Initialize KeyFormat in ephemeralForTest UniqueIndexData
Branch: master
https://github.com/mongodb/mongo/commit/036d37afdade212ee4e43b6fe06a655cdb76e228

Comment by Kyle Suarez [ 17/Jun/21 ]

I believe it's complaining because the UniqueIndexData default constructor does not initialize the _keyFormat field.

// Helper to interpret index data buffer for unique index
class UniqueIndexData {
public:
    UniqueIndexData() : _size(0), _begin(nullptr), _end(nullptr) {}

https://github.com/mongodb/mongo/blob/80fad147597bf47f77980ced8f3dbbc937d95435/src/mongo/db/storage/ephemeral_for_test/ephemeral_for_test_sorted_impl.cpp#L100

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