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ovl: fix random return value on mount

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commit 8fc646b443 upstream.

On failure to prepare_creds(), mount fails with a random
return value, as err was last set to an integer cast of
a valid lower mnt pointer or set to 0 if inodes index feature
is enabled.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 3fe6e52f06 ("ovl: override creds with the ones from ...")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Amir Goldstein 2017-07-11 15:58:35 +03:00 committed by Greg Kroah-Hartman
parent 5cf84432b4
commit 97de6f34b4
1 changed files with 1 additions and 0 deletions
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fs/overlayfs/super.c
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@ -1310,6 +1310,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
else
sb->s_d_op = &ovl_dentry_operations;
err = -ENOMEM;
ufs->creator_cred = cred = prepare_creds();
if (!cred)
goto out_put_lower_mnt;