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Fix Hurd getcwd build with GCC >= 13

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The build of glibc for i686-gnu has been failing for a while with GCC
mainline / GCC 13:

../sysdeps/mach/hurd/getcwd.c: In function '__hurd_canonicalize_directory_name_internal':
../sysdeps/mach/hurd/getcwd.c:242:48: error: pointer 'file_name' may be used after 'realloc' [-Werror=use-after-free]
  242 |                   file_namep = &buf[file_namep - file_name + size / 2];
      |                                     ~~~~~~~~~~~^~~~~~~~~~~
../sysdeps/mach/hurd/getcwd.c:236:25: note: call to 'realloc' here
  236 |                   buf = realloc (file_name, size);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~

Fix by doing the subtraction before the reallocation.

Tested with build-many-glibcs.py for i686-gnu.

[samuel.thibault@ens-lyon.rg: Removed mention of this being a bug]

Message-Id: <18587337-7815-4056-ebd0-724df262d591@codesourcery.com>
This commit is contained in:
Joseph Myers 2023-04-26 17:14:18 +00:00 • committed by Samuel Thibault
parent bcca5ae804
commit af16a59ee1
1 changed files with 3 additions and 2 deletions
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5
sysdeps/mach/hurd/getcwd.c
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@ -222,8 +222,9 @@ __hurd_canonicalize_directory_name_internal (file_t thisdir,
found:
{
/* Prepend the directory name just discovered. */
size_t offset = file_namep - file_name;
if (file_namep - file_name < d->d_namlen + 1)
if (offset < d->d_namlen + 1)
{
if (orig_size > 0)
{
@ -239,7 +240,7 @@ __hurd_canonicalize_directory_name_internal (file_t thisdir,
free (file_name);
return NULL;
}
file_namep = &buf[file_namep - file_name + size / 2];
file_namep = &buf[offset + size / 2];
file_name = buf;
/* Move current contents up to the end of the buffer.
This is guaranteed to be non-overlapping. */