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[Bug binutils/2735] New: Segmentation fault in bfd.c during error handli


From: langton at gcc dot gnu dot org
Subject: [Bug binutils/2735] New: Segmentation fault in bfd.c during error handling
Date: 8 Jun 2006 18:36:54 -0000

ld version 2.16.1 crashes due to a null pointer when trying to report a warning
related to a gcc object file compiled with -fopenmp.  The offending line in
2.16.1 is bfd.c:481, where abfd is NULL:

if (p[1] == 'B')
  {
    bfd *abfd = va_arg (ap, bfd *);
    if (abfd->my_archive)
      snprintf (bufp, avail, "%s(%s)",
                abfd->my_archive->filename, abfd->filename);

This bug can be reproduced using as follows, using the 2 files ctp.c and
csimple.c, and gcc 4.2.0 20060601.  (The ld -r line is necessary here.)

(776)% cat ctp.c
float matrix;

void ctp()
{
#pragma omp threadprivate(matrix)
  matrix = 0.0;
}
(777)% cat csimple.c 
void ctp();

int main()
{
  ctp();
  return 0;
}
(778)% gcc -fopenmp -c ctp.c
(779)% ld -r ctp.o -o ctpr.o
(780)% gcc -fopenmp csimple.c ctp.o
(781)% gcc -fopenmp csimple.c ctpr.o
collect2: ld terminated with signal 11 [Segmentation fault], core dumped
ld: (782)% 

I modified bfd.c so I could get the error message that should have been printed,
which was:

(792)% gcc -fopenmp csimple.c ctpr.o
ld: Warning: alignment 1 of symbol `matrix' in
abfd->my_archive->filename(abfd->filename) is smaller than 4 in ctpr.o

-- 
           Summary: Segmentation fault in bfd.c during error handling
           Product: binutils
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: langton at gcc dot gnu dot org
                CC: bug-binutils at gnu dot org
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=2735

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