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fat/nls: Fix handling of utf8 invalid char

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With utf8 option, vfat allowed the duplicated filenames.

Normal nls returns -EINVAL for invalid char. But utf8s_to_utf16s()
skipped the invalid char historically.

So, this changes the utf8s_to_utf16s() directly to return -EINVAL for
invalid char, because vfat is only user of it.

mkdir /mnt/fatfs
FILENAME=`echo -ne "invalidutf8char_\\0341_endofchar"`
echo "Using filename: $FILENAME"
dd if=/dev/zero of=fatfs bs=512 count=128
mkdosfs -F 32 fatfs
mount -o loop,utf8 fatfs /mnt/fatfs
touch "/mnt/fatfs/$FILENAME"
umount /mnt/fatfs
mount -o loop,utf8 fatfs /mnt/fatfs
touch "/mnt/fatfs/$FILENAME"
ls -l /mnt/fatfs
umount /mnt/fatfs

----  And the output is:

Using filename: invalidutf8char_\0341_endofchar
128+0 records in
128+0 records out
65536 bytes (66 kB) copied, 0.000388118 s, 169 MB/s
mkdosfs 2.11 (12 Mar 2005)
total 0
-rwxr-xr-x 1 root root 0 Jun 28 19:46 invalidutf8char__endofchar
-rwxr-xr-x 1 root root 0 Jun 28 19:46 invalidutf8char__endofchar

Tested-by: Marton Balint <[email protected]>
Signed-off-by: OGAWA Hirofumi <[email protected]>
This commit is contained in:
OGAWA Hirofumi 2009-08-01 21:30:31 +09:00
commit 67638e4043
2 changed files with 8 additions and 15 deletions
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15
fs/fat/namei_vfat.c
View file

@ -499,17 +499,10 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
int charlen;
if (utf8) {
int name_len = strlen(name);
*outlen = utf8s_to_utf16s(name, PATH_MAX, (wchar_t *) outname);
/*
* We stripped '.'s before and set len appropriately,
* but utf8s_to_utf16s doesn't care about len
*/
*outlen -= (name_len - len);
if (*outlen > 255)
*outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname);
if (*outlen < 0)
return *outlen;
else if (*outlen > 255)
return -ENAMETOOLONG;
op = &outname[*outlen * sizeof(wchar_t)];