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dcache: d_splice_alias should detect loops
I believe this can only happen in the case of a corrupted filesystem. So -EIO looks like the appropriate error. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -2706,6 +2706,11 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
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dput(new);
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return ERR_PTR(-EIO);
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}
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if (d_ancestor(new, dentry)) {
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spin_unlock(&inode->i_lock);
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dput(new);
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return ERR_PTR(-EIO);
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}
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write_seqlock(&rename_lock);
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__d_materialise_dentry(dentry, new);
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write_sequnlock(&rename_lock);
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