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

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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@vger.kernel.org
Link: https://tracker.ceph.com/issues/61200
Reported-by: Frank Schilder <frans@dtu.dk>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2023-05-18 09:47:23 +08:00 committed by Ilya Dryomov
parent 9aaa7eb018
commit 4cafd0400b
1 changed files with 13 additions and 0 deletions
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13
fs/ceph/snap.c
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@ -1111,6 +1111,19 @@ skip_inode:
continue;
adjust_snap_realm_parent(mdsc, child, realm->ino);
}
} else {
/*
* In the non-split case both 'num_split_inos' and
* 'num_split_realms' should be 0, making this a no-op.
* However the MDS happens to populate 'split_realms' list
* in one of the UPDATE op cases by mistake.
*
* Skip both lists just in case to ensure that 'p' is
* positioned at the start of realm info, as expected by
* ceph_update_snap_trace().
*/
p += sizeof(u64) * num_split_inos;
p += sizeof(u64) * num_split_realms;
}
/*