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NTFS: Limit name length in fs/ntfs/unistr.c::ntfs_nlstoucs() to maximum 

allowed by NTFS, i.e. 255 Unicode characters, not including the
      terminating NULL (which is not stored on disk).

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2006-03-23 16:05:11 +00:00
parent f95c4018fd
commit d4faf636d6
2 changed files with 35 additions and 19 deletions
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3
fs/ntfs/ChangeLog
View File

@ -34,6 +34,9 @@ ToDo/Notes:
- Add support for sparse files which have a compression unit of 0.
- Remove all the make_bad_inode() calls. This should only be called
from read inode and new inode code paths.
- Limit name length in fs/ntfs/unistr.c::ntfs_nlstoucs() to maximum
allowed by NTFS, i.e. 255 Unicode characters, not including the
terminating NULL (which is not stored on disk).
2.1.26 - Minor bug fixes and updates.

51
fs/ntfs/unistr.c
View File

@ -1,7 +1,7 @@
/*
* unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2001-2006 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
@ -19,6 +19,8 @@
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/slab.h>
#include "types.h"
#include "debug.h"
#include "ntfs.h"
@ -242,7 +244,7 @@ int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
* map dictates, into a little endian, 2-byte Unicode string.
*
* This function allocates the string and the caller is responsible for
* calling kmem_cache_free(ntfs_name_cache, @outs); when finished with it.
* calling kmem_cache_free(ntfs_name_cache, *@outs); when finished with it.
*
* On success the function returns the number of Unicode characters written to
* the output string *@outs (>= 0), not counting the terminating Unicode NULL
@ -262,37 +264,48 @@ int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
wchar_t wc;
int i, o, wc_len;
/* We don't trust outside sources. */
if (ins) {
/* We do not trust outside sources. */
if (likely(ins)) {
ucs = kmem_cache_alloc(ntfs_name_cache, SLAB_NOFS);
if (ucs) {
if (likely(ucs)) {
for (i = o = 0; i < ins_len; i += wc_len) {
wc_len = nls->char2uni(ins + i, ins_len - i,
&wc);
if (wc_len >= 0) {
if (wc) {
if (likely(wc_len >= 0 &&
o < NTFS_MAX_NAME_LEN)) {
if (likely(wc)) {
ucs[o++] = cpu_to_le16(wc);
continue;
} /* else (!wc) */
} /* else if (!wc) */
break;
} /* else (wc_len < 0) */
goto conversion_err;
} /* else if (wc_len < 0 ||
o >= NTFS_MAX_NAME_LEN) */
goto name_err;
}
ucs[o] = 0;
*outs = ucs;
return o;
} /* else (!ucs) */
ntfs_error(vol->sb, "Failed to allocate name from "
"ntfs_name_cache!");
} /* else if (!ucs) */
ntfs_error(vol->sb, "Failed to allocate buffer for converted "
"name from ntfs_name_cache.");
return -ENOMEM;
} /* else (!ins) */
ntfs_error(NULL, "Received NULL pointer.");
} /* else if (!ins) */
ntfs_error(vol->sb, "Received NULL pointer.");
return -EINVAL;
conversion_err:
ntfs_error(vol->sb, "Name using character set %s contains characters "
"that cannot be converted to Unicode.", nls->charset);
name_err:
kmem_cache_free(ntfs_name_cache, ucs);
return -EILSEQ;
if (wc_len < 0) {
ntfs_error(vol->sb, "Name using character set %s contains "
"characters that cannot be converted to "
"Unicode.", nls->charset);
i = -EILSEQ;
} else /* if (o >= NTFS_MAX_NAME_LEN) */ {
ntfs_error(vol->sb, "Name is too long (maximum length for a "
"name on NTFS is %d Unicode characters.",
NTFS_MAX_NAME_LEN);
i = -ENAMETOOLONG;
}
return i;
}
/**