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authorJames Smart <jsmart2021@gmail.com>2020-03-22 11:12:59 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2020-03-26 23:15:10 -0400
commit807e7353d8a7105ce884d22b0dbc034993c6679c (patch)
tree565178e57bb4b4c63067a7ee4e979272bb0c0600 /drivers/scsi
parent1543af381e7b784fbc896047a037b6d9ee6e9b6f (diff)
scsi: lpfc: Fix crash in target side cable pulls hitting WAIT_FOR_UNREG
Kernel is crashing with the following stacktrace: BUG: unable to handle kernel NULL pointer dereference at 00000000000005bc IP: lpfc_nvme_register_port+0x1a8/0x3a0 [lpfc] ... Call Trace: lpfc_nlp_state_cleanup+0x2b2/0x500 [lpfc] lpfc_nlp_set_state+0xd7/0x1a0 [lpfc] lpfc_cmpl_prli_prli_issue+0x1f7/0x450 [lpfc] lpfc_disc_state_machine+0x7a/0x1e0 [lpfc] lpfc_cmpl_els_prli+0x16f/0x1e0 [lpfc] lpfc_sli_sp_handle_rspiocb+0x5b2/0x690 [lpfc] lpfc_sli_handle_slow_ring_event_s4+0x182/0x230 [lpfc] lpfc_do_work+0x87f/0x1570 [lpfc] kthread+0x10d/0x130 ret_from_fork+0x35/0x40 During target side fault injections, it is possible to hit the NLP_WAIT_FOR_UNREG case in lpfc_nvme_remoteport_delete. A prior commit fixed a rebind and delete race condition, but called lpfc_nlp_put unconditionally. This triggered a deletion and the crash. Fix by movng nlp_put to inside the NLP_WAIT_FOR_UNREG case, where the nlp will be being unregistered/removed. Leave the reference if the flag isn't set. Link: https://lore.kernel.org/r/20200322181304.37655-8-jsmart2021@gmail.com Fixes: b15bd3e6212e ("scsi: lpfc: Fix nvme remoteport registration race conditions") Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/lpfc/lpfc_nvme.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index f6c8963c915d..32b28651039e 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -382,13 +382,15 @@ lpfc_nvme_remoteport_delete(struct nvme_fc_remote_port *remoteport)
if (ndlp->upcall_flags & NLP_WAIT_FOR_UNREG) {
ndlp->nrport = NULL;
ndlp->upcall_flags &= ~NLP_WAIT_FOR_UNREG;
- }
- spin_unlock_irq(&vport->phba->hbalock);
+ spin_unlock_irq(&vport->phba->hbalock);
- /* Remove original register reference. The host transport
- * won't reference this rport/remoteport any further.
- */
- lpfc_nlp_put(ndlp);
+ /* Remove original register reference. The host transport
+ * won't reference this rport/remoteport any further.
+ */
+ lpfc_nlp_put(ndlp);
+ } else {
+ spin_unlock_irq(&vport->phba->hbalock);
+ }
rport_err:
return;