Validation could read after the end-of-file when handle multifile database [CORE5295] #5573
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Modified by: @hvladassignee: Vlad Khorsun [ hvlad ] |
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Commented by: @hvlad While v2.5 is not directly affected by this bug (as corresponding validatin code was introduced in v3) |
Modified by: @hvladstatus: Open [ 1 ] => Resolved [ 5 ] resolution: Fixed [ 1 ] Fix Version: 2.5.6 [ 10721 ] Fix Version: 3.0.1 [ 10730 ] Fix Version: 4.0 Alpha 1 [ 10731 ] |
Modified by: @pavel-zotovstatus: Resolved [ 5 ] => Resolved [ 5 ] QA Status: No test => Done successfully |
Modified by: @pavel-zotovstatus: Resolved [ 5 ] => Closed [ 6 ] |
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Submitted by: @hvlad
If multifile database have some (non-last) file with size less than maximum allowed for this file, engine could attempt to read after the end of such file.
Corresponding code is called by validation only. Database is not corrupted.
Test case
a) make backup
gbak -b EMPLOYEE.FDB EMPLOYEE.FBK
b) restore it into multifile database, make first file big enougth to fit whole database
gbak -r -v EMPLOYEE.FBK EMPLOYEE-1.FDB 100000 EMPLOYEE-2.FDB
gbak:opened file EMPLOYEE.FBK
gbak:transportable backup -- data in XDR format
gbak: backup file is compressed
gbak:backup version is 10
gbak:created database EMPLOYEE-1.FDB, page_size 8192 bytes
gbak:started transaction
gbak:adding file EMPLOYEE-2.FDB, starting at page 100001
gbak:committing secondary files
...
gbak:finishing, closing, and going home
gbak:adjusting the ONLINE and FORCED WRITES flags
c) validate restored database
gfix -v EMPLOYEE-1.FDB
I/O error during "ReadFile" operation for file "EMPLOYEE-1.FDB"
-Error while trying to read from file
-Reached the end of file
Commits: d62260d 2b58717 92d0ca8
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