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| author | Matt Fleming <matt.fleming@intel.com> | 2013-03-05 13:46:30 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2013-03-06 15:46:30 +0100 |
| commit | feff5dc4f98330d8152b521acc2e18c16712e6c8 (patch) | |
| tree | 9d4180eb62dcb4f1d111acc3c1e000e82c80b1f6 | |
| parent | efivars: efivarfs_valid_name() should handle pstore syntax (diff) | |
| download | linux-feff5dc4f98330d8152b521acc2e18c16712e6c8.tar.xz linux-feff5dc4f98330d8152b521acc2e18c16712e6c8.zip | |
efivarfs: return accurate error code in efivarfs_fill_super()
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>
| -rw-r--r-- | drivers/firmware/efivars.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 1b9a6e17e3dc..bea32d1ef7d5 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -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); + + d = d_alloc(parent, &q); + if (d) + return d; - return d_alloc(parent, &q); + 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, |