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authorMatt Fleming <matt.fleming@intel.com>2014-03-16 12:14:49 +0000
committerMark Brown <broonie@linaro.org>2014-07-23 21:06:46 +0100
commit0a421a5ce423f9c06f515067e625349a3b19e112 (patch)
tree799af942b9f502824ca4f44dce175db74814fbfd
parent3abf158377f8bf95e3ac149605ade4c24c80de77 (diff)
downloadlinux-linaro-stable-0a421a5ce423f9c06f515067e625349a3b19e112.tar.gz
efivars: Use local variables instead of a pointer dereference
In order to support a compat interface we need to stop passing pointers to structures around, since the type of structure is going to depend on whether the current task is a compat task. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com> (cherry picked from commit bafc84d539c0ffa916037840df54428623abc3e6) Signed-off-by: Mark Brown <broonie@linaro.org>
-rw-r--r--drivers/firmware/efi/efivars.c48
1 files changed, 35 insertions, 13 deletions
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 50ea412a25e6..06ec6ee1c58a 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -197,37 +197,48 @@ static ssize_t
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
{
struct efi_variable *new_var, *var = &entry->var;
+ efi_char16_t *name;
+ unsigned long size;
+ efi_guid_t vendor;
+ u32 attributes;
+ u8 *data;
int err;
if (count != sizeof(struct efi_variable))
return -EINVAL;
new_var = (struct efi_variable *)buf;
+
+ attributes = new_var->Attributes;
+ vendor = new_var->VendorGuid;
+ name = new_var->VariableName;
+ 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(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) ||
- efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) {
+ 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 ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){
+ if ((size <= 0) || (attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
- if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
+ if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
+ efivar_validate(new_var, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
memcpy(&entry->var, new_var, count);
- err = efivar_entry_set(entry, new_var->Attributes,
- new_var->DataSize, new_var->Data, NULL);
+ err = efivar_entry_set(entry, attributes, size, data, NULL);
if (err) {
printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
return -EIO;
@@ -328,13 +339,20 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
{
struct efi_variable *new_var = (struct efi_variable *)buf;
struct efivar_entry *new_entry;
+ unsigned long size;
+ u32 attributes;
+ u8 *data;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
- efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
+ attributes = new_var->Attributes;
+ size = new_var->DataSize;
+ data = new_var->Data;
+
+ if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
+ efivar_validate(new_var, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
@@ -345,8 +363,8 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
memcpy(&new_entry->var, new_var, sizeof(*new_var));
- err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize,
- new_var->Data, &efivar_sysfs_list);
+ err = efivar_entry_set(new_entry, attributes, size,
+ data, &efivar_sysfs_list);
if (err) {
if (err == -EEXIST)
err = -EINVAL;
@@ -370,14 +388,18 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
{
struct efi_variable *del_var = (struct efi_variable *)buf;
struct efivar_entry *entry;
+ efi_char16_t *name;
+ efi_guid_t vendor;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
+ name = del_var->VariableName;
+ vendor = del_var->VendorGuid;
+
efivar_entry_iter_begin();
- entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid,
- &efivar_sysfs_list, true);
+ entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
if (!entry)
err = -EINVAL;
else if (__efivar_entry_delete(entry))