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* [Bug libfortran/31286] New: cshift uses uninitialized variables
@ 2007-03-20 19:23 burnus at gcc dot gnu dot org
2007-03-23 21:20 ` [Bug libfortran/31286] " fxcoudert at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: burnus at gcc dot gnu dot org @ 2007-03-20 19:23 UTC (permalink / raw)
To: gcc-bugs
As found by Salvatore Filippone using valgrind.
-----------------------
program testcshft
integer :: alist(4)
!!$alist = (/1,2,3,4/)
alist =cshift(alist,-1)
write(*,*) alist
end program testcshft
-------------------------
==6801== Conditional jump or move depends on uninitialised value(s)
> ==6801== at 0x1B98AF30: cshift0 (cshift0.c:193)
> ==6801== by 0x8048673: MAIN__
Analysis by me:
alist = cshift(alist,-1)
This calls cshift0(ret, array, shift, which, size)
where size = GFC_DESCRIPTOR_RANK (array)
and "which" is the dimension (not given -> 1)
Thus: which == size == 1.
In cshift0 one finds:
which = which - 1;
for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
{
if (dim == which) { ... }
else
{ sstride[n] = ... }
}
if (sstride[0] == 0)
That is: If which == rank of the array, sstride gets never initialized.
Index: libgfortran/intrinsics/cshift0.c
===================================================================
*** libgfortran/intrinsics/cshift0.c (revision 123083)
--- libgfortran/intrinsics/cshift0.c (working copy)
*************** cshift0 (gfc_array_char * ret, const gfc
*** 103,108 ****
--- 103,110 ----
runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
which = which - 1;
+ sstride[0] = 0;
+ rstride[0] = 0;
extent[0] = 1;
count[0] = 0;
--
Summary: cshift uses uninitialized variables
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: wrong-code, patch
Severity: normal
Priority: P3
Component: libfortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31286
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/31286] cshift uses uninitialized variables
2007-03-20 19:23 [Bug libfortran/31286] New: cshift uses uninitialized variables burnus at gcc dot gnu dot org
@ 2007-03-23 21:20 ` fxcoudert at gcc dot gnu dot org
2007-04-17 21:39 ` fxcoudert at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2007-03-23 21:20 UTC (permalink / raw)
To: gcc-bugs
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-03-23 21:20:08
date| |
Target Milestone|--- |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31286
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/31286] cshift uses uninitialized variables
2007-03-20 19:23 [Bug libfortran/31286] New: cshift uses uninitialized variables burnus at gcc dot gnu dot org
2007-03-23 21:20 ` [Bug libfortran/31286] " fxcoudert at gcc dot gnu dot org
@ 2007-04-17 21:39 ` fxcoudert at gcc dot gnu dot org
2007-04-18 8:47 ` fxcoudert at gcc dot gnu dot org
2007-04-18 8:53 ` fxcoudert at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2007-04-17 21:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from fxcoudert at gcc dot gnu dot org 2007-04-17 22:39 -------
Your patch is pre-approved :)
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |burnus at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31286
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/31286] cshift uses uninitialized variables
2007-03-20 19:23 [Bug libfortran/31286] New: cshift uses uninitialized variables burnus at gcc dot gnu dot org
2007-03-23 21:20 ` [Bug libfortran/31286] " fxcoudert at gcc dot gnu dot org
2007-04-17 21:39 ` fxcoudert at gcc dot gnu dot org
@ 2007-04-18 8:47 ` fxcoudert at gcc dot gnu dot org
2007-04-18 8:53 ` fxcoudert at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2007-04-18 8:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from fxcoudert at gcc dot gnu dot org 2007-04-18 09:47 -------
Subject: Bug 31286
Author: fxcoudert
Date: Wed Apr 18 09:47:28 2007
New Revision: 123944
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123944
Log:
PR libfortran/31286
PR libfortran/31296
* intrinsics/cshift0.c (cshift0): Initialize sstride[0] and rstride[0].
* intrinsics/unpack_generic.c (unpack0, unpack0_char): Zero the
array structures we pass to unpack_internal.
Modified:
trunk/libgfortran/ChangeLog
trunk/libgfortran/ChangeLog-2004
trunk/libgfortran/ChangeLog-2005
trunk/libgfortran/ChangeLog-2006
trunk/libgfortran/intrinsics/cshift0.c
trunk/libgfortran/intrinsics/unpack_generic.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31286
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/31286] cshift uses uninitialized variables
2007-03-20 19:23 [Bug libfortran/31286] New: cshift uses uninitialized variables burnus at gcc dot gnu dot org
` (2 preceding siblings ...)
2007-04-18 8:47 ` fxcoudert at gcc dot gnu dot org
@ 2007-04-18 8:53 ` fxcoudert at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2007-04-18 8:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from fxcoudert at gcc dot gnu dot org 2007-04-18 09:53 -------
Fixed on mainline.
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31286
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-04-18 8:53 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2007-03-20 19:23 [Bug libfortran/31286] New: cshift uses uninitialized variables burnus at gcc dot gnu dot org
2007-03-23 21:20 ` [Bug libfortran/31286] " fxcoudert at gcc dot gnu dot org
2007-04-17 21:39 ` fxcoudert at gcc dot gnu dot org
2007-04-18 8:47 ` fxcoudert at gcc dot gnu dot org
2007-04-18 8:53 ` fxcoudert at gcc dot gnu dot org
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