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-rw-r--r--fs/dcache.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 8c09db9bb2a4..a191eebf1d63 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2653,6 +2653,9 @@ static void __d_materialise_dentry(struct dentry *dentry, struct dentry *anon)
* DCACHE_DISCONNECTED), then d_move that in place of the given dentry
* and return it, else simply d_add the inode to the dentry and return NULL.
*
+ * If a non-IS_ROOT directory is found, the filesystem is corrupt, and
+ * we should error out: directories can't have multiple aliases.
+ *
* This is needed in the lookup routine of any filesystem that is exportable
* (via knfsd) so that we can build dcache paths to directories effectively.
*
@@ -2673,9 +2676,13 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
if (inode && S_ISDIR(inode->i_mode)) {
spin_lock(&inode->i_lock);
- new = __d_find_alias(inode, 1);
+ new = __d_find_any_alias(inode);
if (new) {
- BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED));
+ if (!IS_ROOT(new) || !(new->d_flags & DCACHE_DISCONNECTED)) {
+ spin_unlock(&inode->i_lock);
+ dput(new);
+ return ERR_PTR(-EIO);
+ }
write_seqlock(&rename_lock);
__d_materialise_dentry(dentry, new);
write_sequnlock(&rename_lock);