diff options
| -rw-r--r-- | fs/fat/dir.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/fs/fat/dir.c b/fs/fat/dir.c index a4410740627f..96a1cad30da4 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -325,6 +325,19 @@ parse_long: } /* + * Maximum buffer size of short name. + * [(MSDOS_NAME + '.') * max one char + nul] + * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] + */ +#define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) +/* + * Maximum buffer size of unicode chars from slots. + * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] + */ +#define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) +#define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) + +/* * Return values: negative -> error, 0 -> not found, positive -> found, * value is the total amount of slots, including the shortname entry. */ @@ -340,15 +353,11 @@ int fat_search_long(struct inode *inode, const unsigned char *name, wchar_t bufuname[14]; wchar_t *unicode = NULL; unsigned char work[MSDOS_NAME]; - unsigned char *bufname = NULL; + unsigned char bufname[FAT_MAX_SHORT_SIZE]; unsigned short opt_shortname = sbi->options.shortname; loff_t cpos = 0; int chl, i, j, last_u, err, len; - bufname = __getname(); - if (!bufname) - return -ENOMEM; - err = -ENOENT; while (1) { if (fat_get_entry(inode, &cpos, &bh, &de) == -1) @@ -414,14 +423,17 @@ parse_record: /* Compare shortname */ bufuname[last_u] = 0x0000; - len = fat_uni_to_x8(sbi, bufuname, bufname, PATH_MAX); + len = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); if (fat_name_match(sbi, name, name_len, bufname, len)) goto found; if (nr_slots) { + void *longname = unicode + FAT_MAX_UNI_CHARS; + int size = PATH_MAX - FAT_MAX_UNI_SIZE; + /* Compare longname */ - len = fat_uni_to_x8(sbi, unicode, bufname, PATH_MAX); - if (fat_name_match(sbi, name, name_len, bufname, len)) + len = fat_uni_to_x8(sbi, unicode, longname, size); + if (fat_name_match(sbi, name, name_len, longname, len)) goto found; } } @@ -435,8 +447,6 @@ found: sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); err = 0; end_of_dir: - if (bufname) - __putname(bufname); if (unicode) __putname(unicode); @@ -466,7 +476,8 @@ static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, unsigned char nr_slots; wchar_t bufuname[14]; wchar_t *unicode = NULL; - unsigned char c, work[MSDOS_NAME], bufname[56], *ptname = bufname; + unsigned char c, work[MSDOS_NAME]; + unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname; unsigned short opt_shortname = sbi->options.shortname; int isvfat = sbi->options.isvfat; int nocase = sbi->options.nocase; @@ -620,11 +631,10 @@ parse_record: fill_name = bufname; fill_len = i; if (!short_only && nr_slots) { - /* convert the unicode long name. 261 is maximum size - * of unicode buffer. (13 * slots + nul) */ - void *longname = unicode + 261; - int buf_size = PATH_MAX - (261 * sizeof(unicode[0])); - int long_len = fat_uni_to_x8(sbi, unicode, longname, buf_size); + void *longname = unicode + FAT_MAX_UNI_CHARS; + int long_len, size = PATH_MAX - FAT_MAX_UNI_SIZE; + + long_len = fat_uni_to_x8(sbi, unicode, longname, size); if (!both) { fill_name = longname; |