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

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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 <[email protected]>
Acked-by: Matthew Garrett <[email protected]>
Tested-by: Lee, Chun-Yi <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
This commit is contained in:
Peter Jones 2016-02-08 14:48:12 -05:00 • committed by Matt Fleming
commit e0d64e6a88
2 changed files with 14 additions and 23 deletions
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7
fs/efivarfs/super.c
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@ -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] = '-';