->d_op can bloody well be NULL
Fucked-up-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Fixes: 30d61efe118c "9p: fix ->rename_sem exclusion"
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
diff --git a/fs/dcache.c b/fs/dcache.c
index 903142b324e9..8a605681b26f 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2967,11 +2967,11 @@ static int __d_unalias(struct dentry *dentry, struct dentry *alias)
goto out_err;
m2 = &alias->d_parent->d_inode->i_rwsem;
out_unalias:
- if (alias->d_op->d_unalias_trylock &&
+ if (alias->d_op && alias->d_op->d_unalias_trylock &&
!alias->d_op->d_unalias_trylock(alias))
goto out_err;
__d_move(alias, dentry, false);
- if (alias->d_op->d_unalias_unlock)
+ if (alias->d_op && alias->d_op->d_unalias_unlock)
alias->d_op->d_unalias_unlock(alias);
ret = 0;
out_err:
