[PATCH] ceph: force updating the msg pointer in non-split case

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From: Xiubo Li <xiubli@xxxxxxxxxx>

When the MClientSnap reqeust's op is not CEPH_SNAP_OP_SPLIT the
request may still contain a list of 'split_realms', and we need
to skip it anyway. Or it will be parsed as a corrupt snaptrace.

Cc: stable@xxxxxxxxxxxxxxx
Cc: Frank Schilder <frans@xxxxxx>
Reported-by: Frank Schilder <frans@xxxxxx>
URL: https://tracker.ceph.com/issues/61200
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---
 fs/ceph/snap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 0e59e95a96d9..d95dfe16b624 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -1114,6 +1114,9 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc,
 				continue;
 			adjust_snap_realm_parent(mdsc, child, realm->ino);
 		}
+	} else {
+		p += sizeof(u64) * num_split_inos;
+		p += sizeof(u64) * num_split_realms;
 	}
 
 	/*
-- 
2.40.1




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