Bug#613367: jclassinfo: memory usage problems

TomaszN nowak2000 at poczta.onet.pl
Mon Feb 14 11:19:39 UTC 2011


Package: jclassinfo
Version: 0.19.1-5
Severity: important
Tags: upstream patch

Parsing some classes results with a crash:

(...)
81)CONSTANT_Utf8[1]("too many bytes in \"")
*** glibc detected *** /tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo: free(): invalid next size (fast): 0x08cf5c08 ***
======= Backtrace: =========
/lib/i686/cmov/libc.so.6(+0x6b281)[0xb75bb281]
/lib/i686/cmov/libc.so.6(+0x6cad8)[0xb75bcad8]
/lib/i686/cmov/libc.so.6(cfree+0x6d)[0xb75bfbbd]
/tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo[0x804bf07]
/tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo[0x804bc41]
/tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo[0x804c34c]
/tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo[0x804d8bc]
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0xb7566c76]
/tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo[0x8049a01]
======= Memory map: ========
08048000-08050000 r-xp 00000000 08:05 2313111    /tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo
08050000-08051000 rw-p 00008000 08:05 2313111    /tmp/jclassinfo-0.19.1/jclassinfo/.libs/lt-jclassinfo
08cf4000-08d15000 rw-p 00000000 00:00 0          [heap]
b7400000-b7421000 rw-p 00000000 00:00 0 
b7421000-b7500000 ---p 00000000 00:00 0 
b7517000-b7534000 r-xp 00000000 08:05 1157360    /lib/libgcc_s.so.1
b7534000-b7535000 rw-p 0001c000 08:05 1157360    /lib/libgcc_s.so.1
b754f000-b7550000 rw-p 00000000 00:00 0 
b7550000-b7690000 r-xp 00000000 08:05 1610228    /lib/i686/cmov/libc-2.11.2.so
b7690000-b7692000 r--p 0013f000 08:05 1610228    /lib/i686/cmov/libc-2.11.2.so
b7692000-b7693000 rw-p 00141000 08:05 1610228    /lib/i686/cmov/libc-2.11.2.so
b7693000-b7696000 rw-p 00000000 00:00 0 
b7696000-b76ba000 r-xp 00000000 08:05 1610150    /lib/i686/cmov/libm-2.11.2.so
b76ba000-b76bb000 r--p 00023000 08:05 1610150    /lib/i686/cmov/libm-2.11.2.so
b76bb000-b76bc000 rw-p 00024000 08:05 1610150    /lib/i686/cmov/libPrzerwane


I just increased the size of the char* new_string in jclass/jstring.c by 20 bytes when mallocing; not correct, but works for me.
Additionally fixed some minor memory problems.

To debug, use "valgrind" after "exec" in jclassinfo/jclassinfo:
      exec valgrind $progdir/$program ${1+"$@"}


-- System Information:
Debian Release: 6.0
  APT prefers testing
  APT policy: (650, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores)

Versions of packages jclassinfo depends on:
ii  libc6                   2.11.2-10        Embedded GNU C Library: Shared lib
ii  zlib1g                  1:1.2.3.4.dfsg-3 compression library - runtime

jclassinfo recommends no packages.

jclassinfo suggests no packages.
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