Bug 996583 - Endless loop on broken image files
Summary: Endless loop on broken image files
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: python-exif
Version: 19
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Terje Røsten
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-08-13 13:25 UTC by Nils Philippsen
Modified: 2013-08-23 00:29 UTC (History)
2 users (show)

Fixed In Version: python-exif-1.3.3-1.fc18
Clone Of:
Environment:
Last Closed: 2013-08-23 00:28:17 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)

Description Nils Philippsen 2013-08-13 13:25:37 UTC
Description of problem:
Attempting to read broken images (with EXIF.process_file()) can result in endless loops.

Version-Release number of selected component (if applicable):
python-exif-1.1.0-2.fc19.noarch

How reproducible:
Reproducible

Steps to Reproduce:
1. wget https://github.com/ianare/exif-samples/raw/master/jpg/invalid/image00971.jpg

2a. python -c 'import EXIF; EXIF.process_file(open("image00971.jpg", "rb"))'

OR:

2b. python -c 'import EXIF; EXIF.process_file(open("image00971.jpg", "rb"), debug=True)'

Actual results:
Endless loop, one CPU core hot (100%). With 2b), kilometers of:

[...]
Segment base 0x8B88
Unexpected/unhandled segment type or file content.
Got Segment base 0x8B88
Unexpected/unhandled segment type or file content.
Got Segment base 0x8B88
Unexpected/unhandled segment type or file content.
Got Segment base 0x8B88
Unexpected/unhandled segment type or file content.
Got Segment base 0x8B88
Unexpected/unhandled segment type or file content.
Got Segment base 0x8B88
[...]


Expected results:
Nothing, immediate return.

Additional info:

Comment 1 Nils Philippsen 2013-08-13 15:12:26 UTC
Upstream issue: https://github.com/ianare/exif-py/pull/10

Upstream commit fixing the issue: https://github.com/ianare/exif-py/commit/dbb7f291ec1e31ef256f3c3287cb376492402a7d

This is included in version 1.2.0 and later (1.3.3 is current). Newer tarballs seem to be in a different place than the download URL in the spec file, and it doesn't seem very RPM spec friendly (i.e. the URL's basename doesn't match the actual filename of the tarball):

https://github.com/ianare/exif-py/archive/1.3.3.tar.gz

Comment 2 Fedora Update System 2013-08-13 19:19:55 UTC
python-exif-1.3.3-1.fc19 has been submitted as an update for Fedora 19.
https://admin.fedoraproject.org/updates/python-exif-1.3.3-1.fc19

Comment 3 Fedora Update System 2013-08-13 19:20:03 UTC
python-exif-1.3.3-1.fc18 has been submitted as an update for Fedora 18.
https://admin.fedoraproject.org/updates/python-exif-1.3.3-1.fc18

Comment 4 Nils Philippsen 2013-08-14 08:45:49 UTC
Thanks for the quick fix!

Comment 5 Fedora Update System 2013-08-15 02:31:52 UTC
Package python-exif-1.3.3-1.fc19:
* should fix your issue,
* was pushed to the Fedora 19 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing python-exif-1.3.3-1.fc19'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2013-14690/python-exif-1.3.3-1.fc19
then log in and leave karma (feedback).

Comment 6 Fedora Update System 2013-08-23 00:28:17 UTC
python-exif-1.3.3-1.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2013-08-23 00:29:05 UTC
python-exif-1.3.3-1.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.


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