snap realm and corresponding inode have pointers to each other. The two pointer should get clear at the same time. Otherwise, snap realm's pointer may reference freed inode. Cc: stable@xxxxxxxxxxxxxxx #4.17+ Signed-off-by: "Yan, Zheng" <zyan@xxxxxxxxxx> --- fs/ceph/caps.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 9a7c999d608b..0eaf1b48c431 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -1035,6 +1035,8 @@ static void drop_inode_snap_realm(struct ceph_inode_info *ci) list_del_init(&ci->i_snap_realm_item); ci->i_snap_realm_counter++; ci->i_snap_realm = NULL; + if (realm->ino == ci->i_vino.ino) + realm->inode = NULL; spin_unlock(&realm->inodes_with_caps_lock); ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc, realm); -- 2.17.2
