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efivars: Refactor sanity checking code into separate function

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Move a large chunk of code that checks the validity of efi_variable into
a new function, because we'll also need to use it for the compat code.

Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2014-03-17 15:08:34 +00:00
parent a5d92ad32d
commit 54d2fbfb0c
1 changed files with 32 additions and 20 deletions
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52
drivers/firmware/efi/efivars.c
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@ -189,6 +189,35 @@ efivar_data_read(struct efivar_entry *entry, char *buf)
memcpy(buf, var->Data, var->DataSize);
return var->DataSize;
}
static inline int
sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
unsigned long size, u32 attributes, u8 *data)
{
/*
* If only updating the variable data, then the name
* and guid should remain the same
*/
if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(vendor, var->VendorGuid)) {
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
return -EINVAL;
}
if ((size <= 0) || (attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
return 0;
}
/*
* We allow each variable to be edited via rewriting the
* entire efi variable structure.
@ -215,26 +244,9 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
size = new_var->DataSize;
data = new_var->Data;
/*
* If only updating the variable data, then the name
* and guid should remain the same
*/
if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(vendor, var->VendorGuid)) {
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
return -EINVAL;
}
if ((size <= 0) || (attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
err = sanity_check(var, name, vendor, size, attributes, data);
if (err)
return err;
memcpy(&entry->var, new_var, count);