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Subject[PATCH 4/5] efivars: Refactor sanity checking code into separate function
Date
From: Matt Fleming <matt.fleming@intel.com>

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.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
drivers/firmware/efi/efivars.c | 52 ++++++++++++++++++++++++++----------------
1 file changed, 32 insertions(+), 20 deletions(-)

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 5ee2cfb96698..a44310c6a8ba 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -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);

--
1.8.5.3


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