https://bugs.kde.org/show_bug.cgi?id=524594
Bug ID: 524594
Summary: Malformed metadata in summer_1am wallpaper causes
repeated qt.imageformats.tiff ImageLength warnings
Classification: Plasma
Product: plasmashell
Version First 6.7.4
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Wallpaper images
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
On KDE Plasma 6.7.4 on Arch Linux, opening the wallpaper selector causes
repeated TIFF warnings from KIO/Qt:
qt.imageformats.tiff: "TIFF directory is missing required \"ImageLength\"
field"
I traced the issue and isolated it to this default Plasma wallpaper:
/usr/share/wallpapers/summer_1am/contents/images/2560x1600.jpg
The file is provided by:
plasma-workspace-wallpapers 6.7.4-1
The other resolution JPEG files in summer_1am/contents/images/ are symbolic
links to the same 2560x1600.jpg file.
Steps to reproduce:
1. Have the summer_1am wallpaper installed from plasma-workspace-wallpapers.
2. Run:
dolphin --select /usr/share/wallpapers/summer_1am/contents/images/2560x1600.jpg
3. Dolphin produces repeated warnings:
qt.imageformats.tiff: "TIFF directory is missing required \"ImageLength\"
field"
The same warnings are produced by kioworker when opening Plasma's Desktop and
Wallpaper selector.
Isolation performed:
- I traced the offending kioworker processes with strace.
- summer_1am/contents/images/2560x1600.jpg was consistently accessed around the
TIFF warnings.
- Temporarily moving the entire summer_1am directory outside
/usr/share/wallpapers made the warnings disappear completely.
- Restoring the summer_1am directory made the warnings return.
I then tested whether the JPEG metadata was responsible.
I created a metadata-stripped copy using:
magick /usr/share/wallpapers/summer_1am/contents/images/2560x1600.jpg -strip
/tmp/2560x1600-clean.jpg
The cleaned file remained a valid 2560x1600 JPEG.
Opening the cleaned image with Dolphin produced no TIFF warnings.
I then replaced the packaged 2560x1600.jpg with the tested metadata-stripped
version. After doing this, the TIFF warnings also stopped completely when
opening Plasma's Desktop and Wallpaper selector.
This appears to indicate that malformed TIFF/EXIF metadata is embedded in the
original summer_1am JPEG. The JPEG image data itself appears to be valid and
displays normally.
Original packaged file SHA-256:
c868b50789591dd42910153c768053f1ba0a98cb36bbfc2b7a96a1045d0477f8
System information:
OS: Arch Linux x86_64
KDE Plasma: 6.7.4
Package: plasma-workspace-wallpapers 6.7.4-1
Affected wallpaper: summer_1am
Affected master image: contents/images/2560x1600.jpg
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