[ Upstream commit 9b1640686470fbbd1c6efb35ada6fe1427ea8d0f ]
When unloading the driver, mailbox commands may be sent without holding a reference on the ndlp. By the time the mailbox command completes, the ndlp may have reduced its ref counts and been freed. The problem was reported by KASAN.
While unregistering due to driver unload, have the completion noop'd by setting the ndlp context NULL'd. Due to the unload, no further action was necessary. Also, while reviewing this path, the generic nulling of the context after handling should be slightly moved.
Reported by: Bart Van Assche bvanassche@acm.org Signed-off-by: Dick Kennedy dick.kennedy@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/lpfc/lpfc_hbadisc.c | 4 ++++ drivers/scsi/lpfc/lpfc_sli.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 676f4bf3f33a3..75e9d46d44d42 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -4873,6 +4873,10 @@ lpfc_unreg_rpi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) * accept PLOGIs after unreg_rpi_cmpl */ acc_plogi = 0; + } else if (vport->load_flag & FC_UNLOADING) { + mbox->ctx_ndlp = NULL; + mbox->mbox_cmpl = + lpfc_sli_def_mbox_cmpl; } else { mbox->ctx_ndlp = ndlp; mbox->mbox_cmpl = diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 7d2abb70cf093..dc933b6d7800e 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -2502,8 +2502,8 @@ lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb) } else { ndlp->nlp_flag &= ~NLP_UNREG_INP; } + pmb->ctx_ndlp = NULL; } - pmb->ctx_ndlp = NULL; }
/* Check security permission status on INIT_LINK mailbox command */