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NFSv4.1: Fix Oopsable condition in server callback races
The slot table hasn't been an array since v3.7. Ensure that we
use nfs4_lookup_slot() to access the slot correctly.
Fixes: 87dda67e73
("NFSv4.1: Allow SEQUENCE to resize the slot table...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org # v3.8+
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@ -454,11 +454,8 @@ static bool referring_call_exists(struct nfs_client *clp,
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((u32 *)&rclist->rcl_sessionid.data)[3],
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ref->rc_sequenceid, ref->rc_slotid);
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spin_lock(&tbl->slot_tbl_lock);
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status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
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tbl->slots[ref->rc_slotid].seq_nr ==
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status = nfs4_slot_seqid_in_use(tbl, ref->rc_slotid,
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ref->rc_sequenceid);
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spin_unlock(&tbl->slot_tbl_lock);
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if (status)
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goto out;
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}
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@ -172,6 +172,39 @@ struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid)
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return ERR_PTR(-E2BIG);
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}
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static int nfs4_slot_get_seqid(struct nfs4_slot_table *tbl, u32 slotid,
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u32 *seq_nr)
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__must_hold(&tbl->slot_tbl_lock)
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{
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struct nfs4_slot *slot;
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slot = nfs4_lookup_slot(tbl, slotid);
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if (IS_ERR(slot))
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return PTR_ERR(slot);
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*seq_nr = slot->seq_nr;
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return 0;
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}
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/*
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* nfs4_slot_seqid_in_use - test if a slot sequence id is still in use
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*
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* Given a slot table, slot id and sequence number, determine if the
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* RPC call in question is still in flight. This function is mainly
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* intended for use by the callback channel.
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*/
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bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl, u32 slotid, u32 seq_nr)
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{
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u32 cur_seq;
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bool ret = false;
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spin_lock(&tbl->slot_tbl_lock);
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if (nfs4_slot_get_seqid(tbl, slotid, &cur_seq) == 0 &&
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cur_seq == seq_nr && test_bit(slotid, tbl->used_slots))
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ret = true;
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spin_unlock(&tbl->slot_tbl_lock);
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return ret;
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}
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/*
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* nfs4_alloc_slot - efficiently look for a free slot
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*
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@ -78,6 +78,7 @@ extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
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extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
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extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
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extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid);
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extern bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl, u32 slotid, u32 seq_nr);
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extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
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extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
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extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
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