Bug#909076: ghostscript: ps2ascii crashes: Error: /typecheck in --.bind--

[Mattia Rizzolo]

Package: ghostscript
Version: 9.20~dfsg-3.2+deb9u5
Severity: serious
X-Debbugs-CC: team at security.debian.org, Moritz Mühlenhoff <jmm at debian.org>, reproducible-builds at lists.alioth.debian.org
Control: affects -1 diffoscope

Dear maintainer,

after the latest ghostscript security update, ps2ascii started to crash:

|% ps2ascii /build/diffoscope-101~bpo9+1/.pybuild/pythonX.Y_3.5/build/tests/data/test1.ps
|Error: /typecheck in --.bind--
|Operand stack:
|   --nostringval--   false   setshared   true   --dict:30/32(L)--   typecheck   --nostringval--   currentglobal   .currentglobal
|Execution stack:
|   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1998   2   3   %oparray_pop   1997   2   3   %oparray_pop   1981   2   3   %oparray_pop   1868   2   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   2009   3   3   %oparray_pop   --nostringval--   --nostringval--   --dict:1267/1684(G)--   --nostringval--   1936   %dict_continue   --nostringval--   1974   9   4   %oparray_pop   --nostringval--
|Dictionary stack:
|   --dict:1267/1684(G)--   --dict:0/20(G)--   --dict:81/200(L)--   --dict:1267/1684(G)--
|Current allocation mode is global
|Current file position is 44643
|GPL Ghostscript 9.20: Unrecoverable error, exit code 1


Downgrading to 9.20~dfsg-3.2+deb9u4 shows the problem is limited to the
latest update:

|% ps2ascii /build/diffoscope-101~bpo9+1/.pybuild/pythonX.Y_3.5/build/tests/data/test1.ps
|
|
|Today's date: February 28, 2016
|
|1


This also causes diffoscope (both 78 in stretch and whatever is in
stretch-backports at the moment) to FTBFS.

-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  https://mapreri.org                             : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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