Review Request 127866: Oxygen: Fix QCache usage
Michael Pyne
mpyne at kde.org
Sun Feb 26 00:28:29 GMT 2017
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/127866/
-----------------------------------------------------------
(Updated Feb. 26, 2017, 12:28 a.m.)
Status
------
This change has been marked as submitted.
Review request for kde-workspace and Hugo Pereira Da Costa.
Repository: oxygen
Description
-------
This should mostly complete the QCache fixes I kicked off in a previous RR, 127837. Hugo noted there were many other similar usages, and boy he wasn't kidding! ;) The long story short is that these usages can theoretically cause use-after-free behavior (which can lead to crashes and even undefined behavior if the compiler ever gets smart).
*NOTE* It is -much- easier to review if you download the diff to your git repository for oxygen and then run "git diff -b" to ignore whitespace changes, particularly for the QPixmap changes.
For QPixmaps we return values instead of pointers, so we simply make a separate copy to be cached when we do insert. For QColor we return references to values so we *must* return pointers, and those have to be owned by a QCache to avoid memleaks. So I added a helper function to loop until the cache accepts the new entry. TileSets are a similar concern, except those have manual loops since I was uncertain about whether TileSet's copy constructor was the best idea or not.
This fixes a ton of Coverity issues (59717 - 259733, 259739, 259742 - 259752, 1336154, 1336155) and might be associated with Qt bug 38142 and KDE bug 219055 (which doesn't actually appear to be a dupe of a different bug to me...).
Diffs
-----
kdecoration/oxygendecohelper.cpp aa75eca
kstyle/oxygenstyle.cpp e428606
kstyle/oxygenstylehelper.h 9510a60
kstyle/oxygenstylehelper.cpp 612ba37
liboxygen/oxygenhelper.h a6453a0
liboxygen/oxygenhelper.cpp 4843604
liboxygen/oxygenshadowcache.cpp 907e586
Diff: https://git.reviewboard.kde.org/r/127866/diff/
Testing
-------
Compiled without warnings, installed and ran `oxygen-demo5 -style oxygen`. Used the GUI Benchmark feature to automatically cycle through all the listed features -- no crashes or obvious rendering errors.
Thanks,
Michael Pyne
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/kde-core-devel/attachments/20170226/96aaad21/attachment.htm>
More information about the kde-core-devel
mailing list