Fix race when deleting an EFI variable and issuing another EFI command on the
same variable. The removal of the variable from the efivars_list should be
done in efivar_delete and not delayed until the kprobes release.
Signed-off-by: Prarit Bhargava <[email protected]>
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 5ab5e39..bf2ca97 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -385,10 +385,8 @@ static struct sysfs_ops efivar_attr_ops = {
static void efivar_release(struct kobject *kobj)
{
- struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj);
- spin_lock(&efivars_lock);
- list_del(&var->list);
- spin_unlock(&efivars_lock);
+ struct efivar_entry *var = container_of(kobj, struct efivar_entry,
+ kobj);
kfree(var);
}
@@ -537,6 +535,9 @@ efivar_delete(struct subsystem *sub, const char *buf, size_t count)
spin_unlock(&efivars_lock);
return -EIO;
}
+
+ list_del(&search_efivar->list);
+
/* We need to release this lock before unregistering. */
spin_unlock(&efivars_lock);
-
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