From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
req->r_locked_dir is NULL if the request was created by
open_root_dentry(). ceph_fill_trace() lacks check for this case.
It causes oops when mounting cephfs with non-existing path.
Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
fs/ceph/inode.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 9fff9f3..40e2ef1 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -992,6 +992,13 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
if (rinfo->head->is_dentry) {
struct inode *dir = req->r_locked_dir;
+ /*
+ * req->r_locked_dir is null if the request was created
+ * by open_root_dentry()
+ */
+ if (!dir)
+ return le32_to_cpu(rinfo->head->result);
+
err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
session, req->r_request_started, -1,
&req->r_caps_reservation);
--
1.7.11.2
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