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https://issues.apache.org/jira/browse/COMPRESS-542?focusedWorklogId=466218&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-466218
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ASF GitHub Bot logged work on COMPRESS-542:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 04/Aug/20 13:12
Start Date: 04/Aug/20 13:12
Worklog Time Spent: 10m
Work Description: PeterAlfredLee commented on pull request #120:
URL: https://github.com/apache/commons-compress/pull/120#issuecomment-668587509
I see.
This PR looks good now. Will look more into it these days.
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Issue Time Tracking
-------------------
Worklog Id: (was: 466218)
Time Spent: 0.5h (was: 20m)
> Corrupt 7z allocates huge amount of SevenZEntries
> -------------------------------------------------
>
> Key: COMPRESS-542
> URL: https://issues.apache.org/jira/browse/COMPRESS-542
> Project: Commons Compress
> Issue Type: Bug
> Affects Versions: 1.20
> Reporter: Robin Schimpf
> Priority: Major
> Attachments: Reduced_memory_allocation_for_corrupted_7z_archives.patch
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> We ran into a problem where a 1.43GB corrupt 7z file tried to allocate about
> 138 million SevenZArchiveEntries which will use about 12GB of memory. Sadly
> I'm unable to share the file. If you have enough Memory available the
> following exception is thrown.
> {code:java}
> java.io.IOException: Start header corrupt and unable to guess end Header
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.tryToLocateEndHeader(SevenZFile.java:511)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.readHeaders(SevenZFile.java:470)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:336)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:128)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:369)
> {code}
> 7z itself aborts really quick when I'm trying to list the content of the file.
> {code:java}
> 7z l "corrupt.7z"
> 7-Zip 18.01 (x64) : Copyright (c) 1999-2018 Igor Pavlov : 2018-01-28
> Scanning the drive for archives:
> 1 file, 1537752212 bytes (1467 MiB)
> Listing archive: corrupt.7z
> ERROR: corrupt.7z : corrupt.7z
> Open ERROR: Can not open the file as [7z] archive
> ERRORS:
> Is not archive
> Errors: 1
> {code}
> I hacked together the attached patch which will reduce the memory allocation
> to about 1GB. So lazy instantiation of the entries could be a good solution
> to the problem. Optimal would be to only create the entries if the headers
> could be parsed correctly.
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