[SERVER-65326] Coverity analysis defect 122032: Division or modulo by zero Created: 07/Apr/22  Updated: 06/Dec/22  Resolved: 29/Apr/22

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

Type: Bug Priority: Minor - P4
Reporter: Coverity Collector User Assignee: [DO NOT USE] Backlog - Sharding EMEA
Resolution: Duplicate Votes: 0
Labels: coverity
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File Screen Shot 2022-04-07 at 9.55.43 AM.png    
Issue Links:
Duplicate
duplicates SERVER-65705 Coverity analysis defect 122087: Divi... Closed
Problem/Incident
is caused by SERVER-64196 Implement BalancerStatisticsRegistry ... Closed
Assigned Teams:
Sharding EMEA
Operating System: ALL
Participants:

 Description   

Division or modulo by zero

The program will have undefined behavior, likely a crash. Division or modulo by zero results in undefined behavior.
/src/mongo/db/s/shardsvr_get_stats_for_balancing_command.cpp:103: DIVIDE_BY_ZERO 122032 Assigning: "numRecords" = "autoColl->numRecords(opCtx)". The value of "numRecords" is now 0.
/src/mongo/db/s/shardsvr_get_stats_for_balancing_command.cpp:122: DIVIDE_BY_ZERO 122032 In expression "dataSizeBytes / numRecords", division by expression "numRecords" which may be zero has undefined behavior.



 Comments   
Comment by Pierlauro Sciarelli [ 29/Apr/22 ]

I don't know why coverity opened this ticket 2 times. Closing as duplicate of SERVER-65705

Comment by Kyle Suarez [ 07/Apr/22 ]

Is it true that numRecords is nonzero if and only if dataSizeBytes is nonzero? Sending to the Sharding EMEA team to confirm.

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