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RDMA/nes: Fix Xansation test crash on cm_node ref_count

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While running a Xansation test, an active side node crashed.  The
problem started on the passive side, which generated an STtag that was
0.  The passive side sent a TERMINATE instead of an MPA REJECT msg.
The active side, receives TERMINATE and sends connect_err() and set
the cm_node state to CLOSED.  The passive side sends FIN + ACK after
TERMINATE.  Active side ends up in handle_ack_pkt() and send_reset().
send_reset() consumes 1 cm_node's ref_count.  Because the cm_node is
in CLOSED state, which means that cm_node will be destroyed after
completion of the connect_err() indication, CM will crash after
send_reset().

Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Faisal Latif 2009-12-09 15:54:18 -08:00 committed by Roland Dreier
parent f9f3f1e08b
commit 886f98a315
1 changed files with 16 additions and 1 deletions
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17
drivers/infiniband/hw/nes/nes_cm.c
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@ -1610,6 +1610,7 @@ static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
break;
case NES_CM_STATE_CLOSED:
cleanup_retrans_entry(cm_node);
add_ref_cm_node(cm_node);
send_reset(cm_node, skb);
break;
case NES_CM_STATE_TSA:
@ -1661,9 +1662,15 @@ static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
passive_open_err(cm_node, skb, 1);
break;
case NES_CM_STATE_LISTENING:
cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
cleanup_retrans_entry(cm_node);
cm_node->state = NES_CM_STATE_CLOSED;
send_reset(cm_node, skb);
break;
case NES_CM_STATE_CLOSED:
cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
cleanup_retrans_entry(cm_node);
add_ref_cm_node(cm_node);
send_reset(cm_node, skb);
break;
case NES_CM_STATE_ESTABLISHED:
@ -1732,8 +1739,13 @@ static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
dev_kfree_skb_any(skb);
break;
case NES_CM_STATE_LISTENING:
cleanup_retrans_entry(cm_node);
cm_node->state = NES_CM_STATE_CLOSED;
send_reset(cm_node, skb);
break;
case NES_CM_STATE_CLOSED:
cleanup_retrans_entry(cm_node);
add_ref_cm_node(cm_node);
send_reset(cm_node, skb);
break;
case NES_CM_STATE_LAST_ACK:
@ -2193,8 +2205,11 @@ static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_nod
case NES_CM_STATE_CLOSING:
ret = -1;
break;
case NES_CM_STATE_MPAREJ_RCVD:
case NES_CM_STATE_LISTENING:
cleanup_retrans_entry(cm_node);
send_reset(cm_node, NULL);
break;
case NES_CM_STATE_MPAREJ_RCVD:
case NES_CM_STATE_UNKNOWN:
case NES_CM_STATE_INITED:
case NES_CM_STATE_CLOSED: