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libltdl memory corruption

From: Andreas Schwab
Subject: libltdl memory corruption
Date: Mon, 03 Mar 2008 15:39:47 +0100
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (gnu/linux)

libltdl uses memory after free when initialized twice.

$ cat ltdl.c
#include <ltdl.h>

main ()
  lt_dlinit ();
  lt_dlexit ();
  lt_dlinit ();
  lt_dlexit ();
$ gcc ltdl.c -o ltdl -lltdl
$ MALLOC_CHECK_=2 ./ltdl 
Segmentation fault

The bug is that preopen_LTX_get_vtable returns a pointer to memory that
has already been freed by lt_dlexit.


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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