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ceph: clear inode pointer when snap realm gets dropped by its inode

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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@vger.kernel.org # 4.17+
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Luis Henriques <lhenriques@suse.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2019-01-10 15:41:09 +08:00 committed by Ilya Dryomov
parent 49a57857ae
commit d95e674c01
1 changed files with 2 additions and 0 deletions
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2
fs/ceph/caps.c
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@ -1035,6 +1035,8 @@ static void drop_inode_snap_realm(struct ceph_inode_info *ci)
list_del_init(&ci->i_snap_realm_item); list_del_init(&ci->i_snap_realm_item);
ci->i_snap_realm_counter++; ci->i_snap_realm_counter++;
ci->i_snap_realm = NULL; ci->i_snap_realm = NULL;
if (realm->ino == ci->i_vino.ino)
realm->inode = NULL;
spin_unlock(&realm->inodes_with_caps_lock); spin_unlock(&realm->inodes_with_caps_lock);
ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc, ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
realm); realm);