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efivarfs: return accurate error code in efivarfs_fill_super()

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Joseph was hitting a failure case when mounting efivarfs which
resulted in an incorrect error message,

  $ sudo mount -v /sys/firmware/efi/efivars mount: Cannot allocate memory

triggered when efivarfs_valid_name() returned -EINVAL.

Make sure we pass accurate return values up the stack if
efivarfs_fill_super() fails to build inodes for EFI variables.

Reported-by: Joseph Yasi <joe.yasi@gmail.com>
Reported-by: Lingzhu Xiang <lxiang@redhat.com>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: <stable@vger.kernel.org> # v3.8
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2013-03-05 12:46:30 +00:00
parent 123abd76ed
commit feff5dc4f9
1 changed files with 15 additions and 5 deletions
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20
drivers/firmware/efivars.c
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@ -1163,15 +1163,22 @@ static struct dentry_operations efivarfs_d_ops = {
static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
{
struct dentry *d;
struct qstr q;
int err;
q.name = name;
q.len = strlen(name);
if (efivarfs_d_hash(NULL, NULL, &q))
return NULL;
err = efivarfs_d_hash(NULL, NULL, &q);
if (err)
return ERR_PTR(err);
return d_alloc(parent, &q);
d = d_alloc(parent, &q);
if (d)
return d;
return ERR_PTR(-ENOMEM);
}
static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
@ -1181,6 +1188,7 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
struct efivar_entry *entry, *n;
struct efivars *efivars = &__efivars;
char *name;
int err = -ENOMEM;
efivarfs_sb = sb;
@ -1231,8 +1239,10 @@ static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
goto fail_name;
dentry = efivarfs_alloc_dentry(root, name);
if (!dentry)
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
goto fail_inode;
}
/* copied by the above to local storage in the dentry. */
kfree(name);
@ -1259,7 +1269,7 @@ fail_inode:
fail_name:
kfree(name);
fail:
return -ENOMEM;
return err;
}
static struct dentry *efivarfs_mount(struct file_system_type *fs_type,