https://bugzilla.wikimedia.org/show_bug.cgi?id=54105
Web browser: ---
Bug ID: 54105
Summary: image upload fails with complaint about it being a
"corrupt or otherwise unreadable ZIP file."
Product: MediaWiki
Version: 1.21.1
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: major
Priority: Unprioritized
Component: Uploading
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: cl...@snoopycat.ca
CC: bawolff...@gmail.com, bryan.tongm...@gmail.com,
fflo...@wikimedia.org, mtrac...@member.fsf.org
Classification: Unclassified
Mobile Platform: ---
Attempting to upload a specific gif file always fails with the error mentioned
in the summary.
Steps to reproduce:
1. Download the image
http://images.kingdomofloathing.com/itemimages/snakes/12bl.gif
2. Upload file to mediawiki (versions 1.20.2 and 1.21.1 tried)
Results:
Error displayed: "The file is a corrupt or otherwise unreadable ZIP file. It
cannot be properly checked for security."
Image is not uploaded. Source filename field reverts to no image selected.
Expected Results:
Image should be uploaded, with no errors given.
Notes:
I don't see anything wrong with the image---it's a regular (small) gif image,
and not a zip file. There are many other gif images on the site, so it is not
a problem with gif files in general, it is specific to this particular file.
The message is the textual form of the "zip-bad" error, which is returned by
ZipDirectoryReader in a few places. I turned on debug logging, and found the
full failure flow:
-----------
MimeMagic::__construct: loading mime types from
/var/www/wiki/includes/mime.types
MimeMagic::__construct: loading mime info from /var/www/wiki/includes/mime.info
MimeMagic::doGuessMimeType: analyzing head and tail of /tmp/phpWYS1lh for magic
numbers.
MimeMagic::doGuessMimeType: getimagesize detected /tmp/phpWYS1lh as image/gif
MimeMagic::guessMimeType: guessed mime type of /tmp/phpWYS1lh: image/gif
MimeMagic::improveTypeFromExtension: improved mime type for .gif: image/gif
FSFile::getProps: /tmp/phpWYS1lh loaded, 1851 bytes, image/gif.
mime: <image/gif> extension: <gif>
UploadBase::detectScript: checking for embedded scripts and HTML stuff
UploadBase::detectScript: no scripts found
ZipDirectoryReader: Fatal error: trailing bytes after the end of the file
comment
-----------
ZipDirectoryReader's complaint is likely true...but only because it is not a
zip file. Just to be sure I attempted to unzip the file, and only got errors
as expected:
-----------
caution: zipfile comment truncated
warning [12bl.gif]: zipfile claims to be last disk of a multi-part archive;
attempting to process anyway, assuming all parts have been concatenated
together in order. Expect "errors" and warnings...true multi-part support
doesn't exist yet (coming soon).
error [12bl.gif]: missing 6459880350 bytes in zipfile
(attempting to process anyway)
error [12bl.gif]: attempt to seek before beginning of zipfile
(please check that you have transferred or created the zipfile in the
appropriate BINARY mode and that you have compiled UnZip properly)
-----------
Loading the image into gimp, doing a dummy-edit and resaving it without a
comment or with a different comment does not help.
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