Public bug reported:
Binary package hint: libimage-info-perl
Image::Info in perl sometime crashes on JPEG-files while trying to get
EXIF info.
I'm using Image::Info in perl to get EXIF-info from some images. Some JPEG
images created with ufraw 0.10
from RAW-format seem to trigger a crash in the JPEG-module of Image::Info.
To be more specific, it crashes on line 54 in my_read with a "short read"
when it tries to read 2 bytes, but finds 0.
I have tracked the bug and found that it has something to do with a built
in thumbnail.
In process_app1_exif it's trying to recursively process the thumbnail, and
it sets a variable $jdata to point to the data representing the thumbnail
and process that with a "with_io_string". In my case, $jdata is an empty
string, and when _process_file tries to read 2 bytes from the header of
that file, it crashes.
I fixed this on my machine by adding a check around with_io_string to see
if this string is empty before processing it. It seems to work fine, but
my knowledge of the JPEG-standard is limited at best.. :)
I'm using Image::Info in perl to get EXIF-info from some images. I
recently started using ufraw 0.10 to convert from my cameras RAW-format to
JPEG, and it seems to trigger a crash in the JPEG-module of Image::Info.
To be more specific, it crashes on line 54 in my_read with a "short read"
when it tries to read 2 bytes, but finds 0.
I have tracked the bug and found that it has something to do with a built
in thumbnail.
In process_app1_exif it's trying to recursively process the thumbnail, and
it sets a variable $jdata to point to the data representing the thumbnail
and process that with a "with_io_string". In my case, $jdata is an empty
string, and when _process_file tries to read 2 bytes from the header of
that file, it crashes.
I fixed this on my machine by adding a check around with_io_string to see
if this string is empty before processing it. It seems to work fine, but
my knowledge of the JPEG-standard is limited at best.. :)
Here's the patch I made:
--- JPEG.pm.original 2007-04-07 12:59:46.000000000 +0200
+++ JPEG.pm 2007-10-09 14:22:32.000000000 +0200
@@ -272,9 +272,11 @@
my $jdata = substr($data, $ipos, $ilen);
#$info->push_info($i, "JPEGImage" => $jdata);
- with_io_string {
- _process_file($info, $_, $i);
- } $jdata;
+ if (defined $jdata && $jdata ne "") {
+ with_io_string {
+ _process_file($info, $_, $i);
+ } $jdata;
+ }
}
}
** Affects: libimage-info-perl (Ubuntu)
Importance: Undecided
Status: New
--
Can't parse image info: short read (2/0) at /usr/share/perl5/Image/Info/JPEG.pm
line 54.
https://bugs.launchpad.net/bugs/150952
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