Bug#188527: g++-3.2: Stack corruption with variable-length automatic arrays and virtual destructors

[Toni Timonen <ttimonen@users.sourceforge.net>]

Package: g++-3.2
Version: 1:3.2.3-0pre7
Severity: normal
Tags: upstream

Hi,

the following program compiles (compiled as "g++ stackcorrupt.cpp"), 
but crashes when run. It seems that the stack gets corrupted with that
variable-length array when A class with a virtual function is used
and the length assigning variable(foo) is being changed.

stackcorrupt.cpp:
--snip--
class A {
  public:
  virtual ~A() {}
};

int main(void) {
  int foo=1;
  A bar[foo];
  foo++;
  return 0;
}
--snip-- 

The same problem can also be reproduced by using the compiler from the 
gcc-snapshot (20030314-1) or with the g++-3.0 (3.0.4-13). The g++-2.95
(2.95.4-17) does not have the same problem.



-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux mario 2.4.19 #2 su elo    18 10:13:17 EEST 2002 i586
Locale: LANG=fi_FI@euro, LC_CTYPE=fi_FI@euro

Versions of packages g++-3.2 depends on:
ii  gcc-3.2                    1:3.2.3-0pre7 The GNU C compiler
ii  gcc-3.2-base               1:3.2.3-0pre7 The GNU Compiler Collection (base 
ii  libc6                      2.3.1-16      GNU C Library: Shared libraries an
ii  libstdc++5-dev             1:3.2.3-0pre7 The GNU Standard C++ Library v3 (d

-- no debconf information

--
Toni Timonen
Helsinki University of Technology
Department of Engineering Physics and Mathematics