[Pkg-phototools-devel] Bug#897059: libgphoto2-6: libgphoto2 causes corrupted image file transfers

[Matti Hamalainen]

Package: libgphoto2-6
Version: 2.5.17
Severity: normal

Dear Maintainer,

After upgrading libgphoto2 to latest packaged version 2.5.17, I immediately
noticed that the CR2 RAW files fetched via "gphoto2 -P" were unreadable by
Darktable, Adobe Lightroom and other RAW image software. My cameras are Canon
EOS 7D Mark II and Canon EOS 500D, connected via USB. The problem occurs with
both cameras.

I quickly noticed that repeated transfers resulted in files with different
SHA256 sums. Downgrading to libgphoto2 to previous 2.5.16 makes the problem go
away, checksums are always consistent. With 2.5.17, each file had different
checksum for each transfer, pointing to serious corruption.

I should state that this is a VERY SERIOUS ISSUE! Usually when I transfer
photos from camera, I also immediately delete them from the camera's memory
card. Fortunately I noticed the problem with only few pictures taken, so I
personally suffered almost no loss... but it could have been much worse!

I have no idea if this affects only Canon cameras, as the changelog for 2.5.17
states various EOS -related changes, but I think notifying upstream would be
appropriate.




-- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.16.5-qcmm (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)