Package: imagemagick
Version: 6:6.2.4.5-0.6.kmr1
Severity: important
I've sent a bug to the imagemagick developers as included
below. The developers confirmed the bug and fixed the bug in
ImageMagick 6.2.6 beta1.
Kevin
------- Original bug report --------
[1]
I believe that DestroyStringInfo is being incorrectly called after
GetImageProfile. I've posted a test case below[1]. It appears that
calling DestroyStringInfo on the profile and then destroying the image
causes an error[2]. I've also posted an example using C that has the
same error result that I believe mirrors what the PerlMagick interface
does.[3]
Looking more closely at GetImageProfile in magick/profile.c, the
string value comes from GetValueFromSplayTree which returns
splay_info->root->value. It appears to be that this StringInfo is
getting freed once my DestroyStringInfo and then again by DestroyImage.
As someone fairly new to the imagemagick source code, I worked around
this by remove the DestroyStringInfo calls that occur after
GetImageProfile in PerlMagick/Magick.xs. With that change, the test
case in [1] now works. However, that may not be the most robust fix.
I appreciate the thoughts of the ImageMagick developers if I'm on the
right track thinking about this or if I'm misunderstanding how to get
ICC profiles using ImageMagick.
[1] test-icc.pl
#!/usr/bin/perl
use Image::Magick;
use Data::Dumper;
my $fname = '/home/hs/1.jpg';
my $image = Image::Magick->new;
my $res = $image->Read('image-with-icc.jpg');
die "$res" if "$res";
$image->Get('icc');
print "about to undef image\n";
undef $image;
print "done\n";
[2]
[EMAIL PROTECTED]:~> ./test-icc.pl
about to undef image
perl: magick/string.c:658: DestroyStringInfo: Assertion
`string_info->signature == 0xabacadabUL' failed.
[3]
#include <stdio.h>
#include <stdlib.h>
#include <magick/ImageMagick.h>
#include <string.h>
int main(int c, char**argv)
{
ExceptionInfo exception;
Image *image, *images, *thumbnails, *resize_image;
ImageInfo *image_info;
InitializeMagick(*argv);
GetExceptionInfo(&exception);
image_info=CloneImageInfo((ImageInfo *) NULL);
(void) strcpy(image_info->filename,"image-icc.jpg");
images=ReadImage(image_info,&exception);
if (exception.severity != UndefinedException)
CatchException(&exception);
if (images == (Image *) NULL) {
printf("can't read image\n");
exit(1);
}
while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
{
StringInfo *si = GetImageProfile(image,"icc");
if (si != (StringInfo *) NULL) {
printf("icc len: %d\n",si->length);
DestroyStringInfo (si);
DestroyImage(image); // Errors here
}
}
image_info=DestroyImageInfo(image_info);
DestroyExceptionInfo(&exception);
DestroyMagick();
printf("done\n");
return(0);
}
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-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.13
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Versions of packages imagemagick depends on:
ii libbz2-1.0 1.0.3-2 high-quality block-sorting file co
ii libc6 2.3.5-12 GNU C Library: Shared libraries an
ii libfreetype6 2.1.10-1 FreeType 2 font engine, shared lib
ii libice6 6.9.0.dfsg.1-4 Inter-Client Exchange library
ii libjasper-1.701-1 1.701.0-2 The JasPer JPEG-2000 runtime libra
ii libjpeg62 6b-11 The Independent JPEG Group's JPEG
ii liblcms1 1.13-1 Color management library
ii libmagick9 6:6.2.4.5-0.6.kmr1 Image manipulation library
ii libpng12-0 1.2.8rel-5 PNG library - runtime
ii libsm6 6.9.0.dfsg.1-4 X Window System Session Management
ii libtiff4 3.7.4-1 Tag Image File Format (TIFF) libra
ii libx11-6 6.9.0.dfsg.1-4 X Window System protocol client li
ii libxext6 6.9.0.dfsg.1-4 X Window System miscellaneous exte
ii libxml2 2.6.23.dfsg.1-0.1 GNOME XML library
ii libxt6 6.9.0.dfsg.1-4 X Toolkit Intrinsics
ii zlib1g 1:1.2.3-9 compression library - runtime
imagemagick recommends no packages.
-- no debconf information
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