Re: libstdc++/10064: crash when using valarray's operator=

Re: libstdc++/10064: crash when using valarray's operator=

[Gabriel Dos Reis]

The following reply was made to PR libstdc++/10064; it has been noted by GNATS.

From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: Brian.R.Landy@mortgage.wellsFargo.COM
Cc: libstdc++@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: libstdc++/10064: crash when using valarray's operator=
Date: 14 Mar 2003 16:33:30 +0100

 Brian.R.Landy@mortgage.wellsFargo.COM writes:
 
 | Sorry, I assumed it should resize since MS's STL (in VC++ 6.0) does resize.
 | I take it this is particular to valarray? 
 
 Yes, the behaviour I was describing is particular to valarray<> -- as
 opposed to vector<> which does resizing.  Valarray<> should be thought
 of as a low level building bloc.  Automatic resizing is too high level
 for the purpose of valarray.
 
 | Because I think I remember
 | checking vector (in gcc's STL) and it does.   By undefined do you mean that
 | the behavior is left up to the implementer, or that MS should not do the
 | resize?  Thanks!
 
 By "undefined behaviour", I meant what the C++ standard means.
 Anything can happen.  The implementation may accept or reject it, or
 the program may reformat your hard drive.
 
 Thanks,
 
 -- Gaby

Re: libstdc++/10064: crash when using valarray's operator=

[Gabriel Dos Reis]

The following reply was made to PR libstdc++/10064; it has been noted by GNATS.

From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: brian.r.landy@wellsfargo.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: libstdc++/10064: crash when using valarray's operator=
Date: 14 Mar 2003 14:37:11 +0100

 brian.r.landy@wellsfargo.com writes:
 
 | >Number:         10064
 | >Category:       libstdc++
 | >Synopsis:       crash when using valarray's operator=
 | >Confidential:   no
 | >Severity:       serious
 | >Priority:       medium
 | >Responsible:    unassigned
 | >State:          open
 | >Class:          sw-bug
 | >Submitter-Id:   net
 | >Arrival-Date:   Thu Mar 13 19:56:01 UTC 2003
 | >Closed-Date:
 | >Last-Modified:
 | >Originator:     Brian Landy
 | >Release:        gcc version 3.2
 | >Organization:
 | >Environment:
 | AIX 4.3, cygwin, ...
 | >Description:
 | There is a bug in the dfinition of:
 | 
 |    valarray<_Tp>::operator= (const valarray<_Tp>& __v)
 | 
 | The target valarray is not resized to match the size of the source
 | valarray before copying.  
 
 This is not a bug.  
 
 It is an undefined behaviour if both operands of operator= doe not
 have the ame size.
 
 -- Gaby

Re: libstdc++/10064: crash when using valarray's operator=

[gdr]

Synopsis: crash when using valarray's operator=

Responsible-Changed-From-To: unassigned->gdr
Responsible-Changed-By: gdr
Responsible-Changed-When: Fri Mar 14 13:39:58 2003
Responsible-Changed-Why:
    Mine
State-Changed-From-To: open->closed
State-Changed-By: gdr
State-Changed-When: Fri Mar 14 13:39:58 2003
State-Changed-Why:
    Not a bug.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10064

libstdc++/10064: crash when using valarray's operator=

[brian.r.landy]

>Number:         10064
>Category:       libstdc++
>Synopsis:       crash when using valarray's operator=
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 13 19:56:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Brian Landy
>Release:        gcc version 3.2
>Organization:
>Environment:
AIX 4.3, cygwin, ...
>Description:
There is a bug in the dfinition of:

   valarray<_Tp>::operator= (const valarray<_Tp>& __v)

The target valarray is not resized to match the size of the source valarray before copying.  Then, the size of the target valarray is used to determine what elements to copy.  This means the assignment always succeeds, but (assuming the target valarray has size==0) any attempt to access the target valarray causes a crash.
>How-To-Repeat:
I've attached a .ii that reproduces the problem.
>Fix:
This patch (to include/c++/3.2/valarray) resolves the problem:

--- valarray.old        2002-08-19 11:18:44.000000000 -0500
+++ valarray    2003-01-10 09:29:48.000000000 -0600
@@ -336,6 +336,9 @@
   inline valarray<_Tp>&
   valarray<_Tp>::operator= (const valarray<_Tp>& __v)
   {
+      if (this == &__v)
+          return *this;
+      resize(__v._M_size);
       __valarray_copy(__v._M_data, _M_size, _M_data);
       return *this;
   }
>Release-Note:
>Audit-Trail:
>Unformatted:
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Content-Disposition: attachment; filename="valarrtest.ii"

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