Hunting down a refcount issue in an out-of-tree filesystem uncovered
that its lookup function directly returned the dentry which was passed to it.
Add a BUG_ON() to detect such misuse in future.
Signed-off-by: Richard Weinberger <richard@xxxxxx>
---
fs/namei.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/namei.c b/fs/namei.c
index bc35b02..f8ccae6 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1370,6 +1370,7 @@ static struct dentry *lookup_real(struct inode *dir, struct dentry *dentry,
old = dir->i_op->lookup(dir, dentry, flags);
if (unlikely(old)) {
+ BUG_ON(old == dentry);
dput(dentry);
dentry = old;
}
--
2.2.2
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