efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version

commit e0d64e6a880e64545ad7d55786aa84ab76bac475 upstream.

Translate EFI's UCS-2 variable names to UTF-8 instead of just assuming
all variable names fit in ASCII.

Signed-off-by: Peter Jones <pjones@redhat.com>
Acked-by: Matthew Garrett <mjg59@coreos.com>
Tested-by: Lee, Chun-Yi <jlee@suse.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 756eca8c4cf8f291025a3ad44f7cbb9981aeb5fd..f4ff8abc5f3e9c1902dfb37450fe13a9acc204da 100644 (file)
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -540,38 +540,30 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
 static int
 efivar_create_sysfs_entry(struct efivar_entry *new_var)
 {
-       int i, short_name_size;
+       int short_name_size;
        char *short_name;
-       unsigned long variable_name_size;
-       efi_char16_t *variable_name;
+       unsigned long utf8_name_size;
+       efi_char16_t *variable_name = new_var->var.VariableName;
        int ret;
 
-       variable_name = new_var->var.VariableName;
-       variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t);
-
        /*
-        * Length of the variable bytes in ASCII, plus the '-' separator,
+        * Length of the variable bytes in UTF8, plus the '-' separator,
         * plus the GUID, plus trailing NUL
         */
-       short_name_size = variable_name_size / sizeof(efi_char16_t)
-                               + 1 + EFI_VARIABLE_GUID_LEN + 1;
-
-       short_name = kzalloc(short_name_size, GFP_KERNEL);
+       utf8_name_size = ucs2_utf8size(variable_name);
+       short_name_size = utf8_name_size + 1 + EFI_VARIABLE_GUID_LEN + 1;
 
+       short_name = kmalloc(short_name_size, GFP_KERNEL);
        if (!short_name)
                return -ENOMEM;
 
-       /* Convert Unicode to normal chars (assume top bits are 0),
-          ala UTF-8 */
-       for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) {
-               short_name[i] = variable_name[i] & 0xFF;
-       }
+       ucs2_as_utf8(short_name, variable_name, short_name_size);
+
        /* This is ugly, but necessary to separate one vendor's
           private variables from another's.         */
-
-       *(short_name + strlen(short_name)) = '-';
+       short_name[utf8_name_size] = '-';
        efi_guid_to_str(&new_var->var.VendorGuid,
-                        short_name + strlen(short_name));
+                        short_name + utf8_name_size + 1);
 
        new_var->kobj.kset = efivars_kset;
 

diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 86a2121828c312e53d64aedee9506319bbadf6c1..0eb73793b737917153fb71a0bfb136bd6ee0ea21 100644 (file)
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -118,7 +118,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
        struct dentry *dentry, *root = sb->s_root;
        unsigned long size = 0;
        char *name;
-       int len, i;
+       int len;
        int err = -ENOMEM;
 
        entry = kzalloc(sizeof(*entry), GFP_KERNEL);
@@ -128,15 +128,14 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
        memcpy(entry->var.VariableName, name16, name_size);
        memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
 
-       len = ucs2_strlen(entry->var.VariableName);
+       len = ucs2_utf8size(entry->var.VariableName);
 
        /* name, plus '-', plus GUID, plus NUL*/
        name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);
        if (!name)
                goto fail;
 
-       for (i = 0; i < len; i++)
-               name[i] = entry->var.VariableName[i] & 0xFF;
+       ucs2_as_utf8(name, entry->var.VariableName, len);
 
        name[len] = '-';