[PATCH AUTOSEL 4.14 07/17] isofs: joliet: Fix iocharset=utf8 mount option

Sasha Levin
2021-09-06T01:35:22Z

From: Pali Rohár <pali@kernel.org>

[ Upstream commit 28ce50f8d96ec9035f60c9348294ea26b94db944 ]

Currently iocharset=utf8 mount option is broken. To use UTF-8 as iocharset,
it is required to use utf8 mount option.

Fix iocharset=utf8 mount option to use be equivalent to the utf8 mount
option.

If UTF-8 as iocharset is used then s_nls_iocharset is set to NULL. So
simplify code around, remove s_utf8 field as to distinguish between UTF-8
and non-UTF-8 it is needed just to check if s_nls_iocharset is set to NULL
or not.

Link: https://lore.kernel.org/r/20210808162453.1653-5-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/isofs/inode.c | 27 +++++++++++++--------------
fs/isofs/isofs.h | 1 -
fs/isofs/joliet.c | 4 +---
3 files changed, 14 insertions(+), 18 deletions(-)

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index a4994e25e19e..f1134752cea3 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -157,7 +157,6 @@ struct iso9660_options{
unsigned int overriderockperm:1;
unsigned int uid_set:1;
unsigned int gid_set:1;
- unsigned int utf8:1;
unsigned char map;
unsigned char check;
unsigned int blocksize;
@@ -357,7 +356,6 @@ static int parse_options(char *options, struct iso9660_options *popt)
popt->gid = GLOBAL_ROOT_GID;
popt->uid = GLOBAL_ROOT_UID;
popt->iocharset = NULL;
- popt->utf8 = 0;
popt->overriderockperm = 0;
popt->session=-1;
popt->sbsector=-1;
@@ -390,10 +388,13 @@ static int parse_options(char *options, struct iso9660_options *popt)
case Opt_cruft:
popt->cruft = 1;
break;
+#ifdef CONFIG_JOLIET
case Opt_utf8:
- popt->utf8 = 1;
+ kfree(popt->iocharset);
+ popt->iocharset = kstrdup("utf8", GFP_KERNEL);
+ if (!popt->iocharset)
+ return 0;
break;
-#ifdef CONFIG_JOLIET
case Opt_iocharset:
kfree(popt->iocharset);
popt->iocharset = match_strdup(&args[0]);
@@ -496,7 +497,6 @@ static int isofs_show_options(struct seq_file *m, struct dentry *root)
if (sbi->s_nocompress) seq_puts(m, ",nocompress");
if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
if (sbi->s_showassoc) seq_puts(m, ",showassoc");
- if (sbi->s_utf8) seq_puts(m, ",utf8");

if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
@@ -519,9 +519,10 @@ static int isofs_show_options(struct seq_file *m, struct dentry *root)
seq_printf(m, ",fmode=%o", sbi->s_fmode);

#ifdef CONFIG_JOLIET
- if (sbi->s_nls_iocharset &&
- strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
+ if (sbi->s_nls_iocharset)
seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
+ else
+ seq_puts(m, ",iocharset=utf8");
#endif
return 0;
}
@@ -865,14 +866,13 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
sbi->s_nls_iocharset = NULL;

#ifdef CONFIG_JOLIET
- if (joliet_level && opt.utf8 == 0) {
+ if (joliet_level) {
char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
- sbi->s_nls_iocharset = load_nls(p);
- if (! sbi->s_nls_iocharset) {
- /* Fail only if explicit charset specified */
- if (opt.iocharset)
+ if (strcmp(p, "utf8") != 0) {
+ sbi->s_nls_iocharset = opt.iocharset ?
+ load_nls(opt.iocharset) : load_nls_default();
+ if (!sbi->s_nls_iocharset)
goto out_freesbi;
- sbi->s_nls_iocharset = load_nls_default();
}
}
#endif
@@ -888,7 +888,6 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
sbi->s_gid = opt.gid;
sbi->s_uid_set = opt.uid_set;
sbi->s_gid_set = opt.gid_set;
- sbi->s_utf8 = opt.utf8;
sbi->s_nocompress = opt.nocompress;
sbi->s_overriderockperm = opt.overriderockperm;
/*
diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
index 8e42b4fbefdc..b4b9d4861c9d 100644
--- a/fs/isofs/isofs.h
+++ b/fs/isofs/isofs.h
@@ -44,7 +44,6 @@ struct isofs_sb_info {
unsigned char s_session;
unsigned int s_high_sierra:1;
unsigned int s_rock:2;
- unsigned int s_utf8:1;
unsigned int s_cruft:1; /* Broken disks with high byte of length
* containing junk */
unsigned int s_nocompress:1;
diff --git a/fs/isofs/joliet.c b/fs/isofs/joliet.c
index be8b6a9d0b92..c0f04a1e7f69 100644
--- a/fs/isofs/joliet.c
+++ b/fs/isofs/joliet.c
@@ -41,14 +41,12 @@ uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
int
get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
{
- unsigned char utf8;
struct nls_table *nls;
unsigned char len = 0;

- utf8 = ISOFS_SB(inode->i_sb)->s_utf8;
nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;

- if (utf8) {
+ if (!nls) {
len = utf16s_to_utf8s((const wchar_t *) de->name,
de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
outname, PAGE_SIZE);
--
2.30.2