[Bug java/23617] New: Out of memory when classpath contains jar file with zip-style comment

["wmahan at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

When trying to compile a file with Debian's gcj 4.0.1-2, I got an error like this:

HelloWorld.java:0: error: malformed .zip archive in CLASSPATH:
/usr/lib/j2re1.5-sun/lib/ext/localedata.jar/

jc1: out of memory allocating 1342179073 bytes after a total of 389120 bytes

It turns out the .jar file the error mentions has a zipfile comment. (JAR is
based on the zip format, which allows an variable-length comment at the end of
the file.) The compilation was successful when I removed the jar file from the
classpath.

Here's a simple test case to summarize: with gcj 4.0.1, the Info-ZIP utility,
and any class, say HelloWorld.java:

$ jar -cf test.jar; gcj -classpath test.jar HelloWorld.java # works fine

$ jar -cf test.jar; echo "some comment" | zip -z test.jar; gcj -classpath
test.jar HelloWorld.java
enter new zip file comment (end with .):

jc1: out of memory allocating 1663067502 bytes after a total of 135168 bytes


This problem is similar to bug 13020 for FastJar. I came up with a similar
solution: modifying zextract.c to check for a zipfile comment, and if necessary
scan backwards for the end-central-header signature. Unfortunately I haven't had
a chance to test the change compiled into gcc, although it appears to work in a
small test program.

-- 
           Summary: Out of memory when classpath contains jar file with zip-
                    style comment
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: wmahan at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23617