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-rw-r--r--fs/namei.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index b8433ebfae0..78f253cd2d4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1248,6 +1248,8 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
int err;
struct qstr this;
+ WARN_ON_ONCE(!mutex_is_locked(&base->d_inode->i_mutex));
+
err = __lookup_one_len(name, &this, base, len);
if (err)
return ERR_PTR(err);