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authorKeith Mok <ek9852@gmail.com>2008-04-28 02:16:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:47 -0700
commitf22032ba8de2960a64a3dd9719fb5c99b1f1ae6e (patch)
treec515ff4c94c041325cede8061a9fe3301ec08e53 /fs/vfat
parent061e97469f46f924cf14bbf1dd4805b46986691a (diff)
vfat: bug fix for vfat cannot handle filename with 255
This patch fix the problem that the buffer allocated for convert of unicode to utf8 in fat/dir.c is too small. And cannot handle filename with 255 asian characters when mounted with utf8 options. Also it fix the filename length limitation checking in vfat/namei.c that the filename length should be checked against the number of converted unicode characters. Not the length before NLS/UTF8 converted. Signed-off-by: Keith Mok <ek9852@gmail.com> Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/vfat')
-rw-r--r--fs/vfat/namei.c25
1 files changed, 11 insertions, 14 deletions
diff --git a/fs/vfat/namei.c b/fs/vfat/namei.c
index efc70576e4b4..ab4f3da770f0 100644
--- a/fs/vfat/namei.c
+++ b/fs/vfat/namei.c
@@ -176,15 +176,10 @@ static inline int vfat_is_used_badchars(const wchar_t *s, int len)
for (i = 0; i < len; i++)
if (vfat_bad_char(s[i]))
return -EINVAL;
- return 0;
-}
-static int vfat_valid_longname(const unsigned char *name, unsigned int len)
-{
- if (name[len - 1] == ' ')
+ if (s[i - 1] == ' ') /* last character cannot be space */
return -EINVAL;
- if (len >= 256)
- return -ENAMETOOLONG;
+
return 0;
}
@@ -485,11 +480,14 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
*/
*outlen -= (name_len - len);
+ if (*outlen > 255)
+ return -ENAMETOOLONG;
+
op = &outname[*outlen * sizeof(wchar_t)];
} else {
if (nls) {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 260;
+ i < len && *outlen <= 255;
*outlen += 1)
{
if (escape && (*ip == ':')) {
@@ -525,18 +523,20 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
op += 2;
}
}
+ if (i < len)
+ return -ENAMETOOLONG;
} else {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 260;
+ i < len && *outlen <= 255;
i++, *outlen += 1)
{
*op++ = *ip++;
*op++ = 0;
}
+ if (i < len)
+ return -ENAMETOOLONG;
}
}
- if (*outlen > 260)
- return -ENAMETOOLONG;
*longlen = *outlen;
if (*outlen % 13) {
@@ -574,9 +574,6 @@ static int vfat_build_slots(struct inode *dir, const unsigned char *name,
loff_t offset;
*nr_slots = 0;
- err = vfat_valid_longname(name, len);
- if (err)
- return err;
page = __get_free_page(GFP_KERNEL);
if (!page)