efivarfs: efivarfs_create() ensure we drop our reference on inode on error

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index b7c9a3261dc..6e5f367145f 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -866,7 +866,7 @@ static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
 static int efivarfs_create(struct inode *dir, struct dentry *dentry,
                           umode_t mode, bool excl)
 {
-        struct inode *inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
+        struct inode *inode;
         struct efivars *efivars = &__efivars;
         struct efivar_entry *var;
         int namelen, i = 0, err = 0;
@@ -874,13 +874,15 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
         if (dentry->d_name.len < 38)
                 return -EINVAL;
 
+        inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
         if (!inode)
                 return -ENOSPC;
 
         var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
-
-        if (!var)
-                return -ENOMEM;
+        if (!var) {
+                err = -ENOMEM;
+                goto out;
+        }
 
         namelen = dentry->d_name.len - GUID_LEN;
 
@@ -908,8 +910,10 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
         d_instantiate(dentry, inode);
         dget(dentry);
 out:
-        if (err)
+        if (err) {
                 kfree(var);
+                iput(inode);
+        }
         return err;
 }