gnu: ExifTool: Fix CVE-2021-22204

* gnu/packages/patches/perl-image-exiftool-CVE-2021-22204.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/photo.scm (perl-image-exiftool)[source]: Use it.

gnu/local.mk

@@ -1525,6 +1525,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/perl-cross.patch				\
   %D%/packages/patches/perl-deterministic-ordering.patch	\
   %D%/packages/patches/perl-finance-quote-unuse-mozilla-ca.patch \
+  %D%/packages/patches/perl-image-exiftool-CVE-2021-22204.patch	\
   %D%/packages/patches/perl-io-socket-ssl-openssl-1.0.2f-fix.patch \
   %D%/packages/patches/perl-net-amazon-s3-moose-warning.patch	\
   %D%/packages/patches/perl-net-dns-resolver-programmable-fix.patch	\

gnu/packages/patches/perl-image-exiftool-CVE-2021-22204.patch

@@ -0,0 +1,38 @@
+Fix CVE-2021-22204:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22204
+
+Patch extracted from commit cf0f4e7dcd024ca99615bfd1102a841a25dde031
+from upstream source repository:
+
+https://github.com/exiftool/exiftool/commit/cf0f4e7dcd024ca99615bfd1102a841a25dde031#diff-fa0d652d10dbcd246e6b1df16c1e992931d3bb717a7e36157596b76bdadb3800
+
+diff --git a/lib/Image/ExifTool/DjVu.pm b/lib/Image/ExifTool/DjVu.pm
+index c284d10..03b3f9f 100644
+--- a/lib/Image/ExifTool/DjVu.pm
++++ b/lib/Image/ExifTool/DjVu.pm
+@@ -18,7 +18,7 @@ use strict;
+ use vars qw($VERSION);
+ use Image::ExifTool qw(:DataAccess :Utils);
+ 
+-$VERSION = '1.06';
++$VERSION = '1.07';
+ 
+ sub ParseAnt($);
+ sub ProcessAnt($$$);
+@@ -227,10 +227,11 @@ Tok: for (;;) {
+                 last unless $tok =~ /(\\+)$/ and length($1) & 0x01;
+                 $tok .= '"';    # quote is part of the string
+             }
+-            # must protect unescaped "$" and "@" symbols, and "\" at end of string
+-            $tok =~ s{\\(.)|([\$\@]|\\$)}{'\\'.($2 || $1)}sge;
+-            # convert C escape sequences (allowed in quoted text)
+-            $tok = eval qq{"$tok"};
++            # convert C escape sequences, allowed in quoted text
++            # (note: this only converts a few of them!)
++            my %esc = ( a => "\a", b => "\b", f => "\f", n => "\n",
++                        r => "\r", t => "\t", '"' => '"', '\\' => '\\' );
++            $tok =~ s/\\(.)/$esc{$1}||'\\'.$1/egs;
+         } else {                # key name
+             pos($$dataPt) = pos($$dataPt) - 1;
+             # allow anything in key but whitespace, braces and double quotes

gnu/packages/photo.scm

@@ -328,6 +328,7 @@ MTP, and much more.")
              ;; New releases may take a while to hit CPAN.
              (string-append "https://www.sno.phy.queensu.ca/~phil/exiftool/"
                             "Image-ExifTool-" version ".tar.gz")))
+       (patches (search-patches "perl-image-exiftool-CVE-2021-22204.patch"))
        (sha256
         (base32
          "0skm22b3gg1bfk0amklrprpva41m6mkrhqp0gi7z1nmcf9ypjh61"))))