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scsi: lpfc: Resolve NULL ptr dereference after an ELS LOGO is aborted

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A use-after-free crash can occur after an ELS LOGO is aborted.

Specifically, a nodelist structure is freed and then
ndlp->vport->cfg_log_verbose is dereferenced in lpfc_nlp_get() when the
discovery state machine is mistakenly called a second time with
NLP_EVT_DEVICE_RM argument.

Rework lpfc_cmpl_els_logo() to prevent the duplicate calls to release a
nodelist structure.

Link: https://lore.kernel.org/r/20220603174329.63777-6-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2022-06-03 10:43:25 -07:00 committed by Martin K. Petersen
parent 6f808bd78e
commit b1b3440f43
1 changed files with 9 additions and 12 deletions
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21
drivers/scsi/lpfc/lpfc_els.c
View file

@ -2998,10 +2998,7 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
ndlp->nlp_DID, ulp_status,
ulp_word4);
/* Call NLP_EVT_DEVICE_RM if link is down or LOGO is aborted */
if (lpfc_error_lost_link(ulp_status, ulp_word4)) {
lpfc_disc_state_machine(vport, ndlp, cmdiocb,
NLP_EVT_DEVICE_RM);
skip_recovery = 1;
goto out;
}
@ -3021,18 +3018,10 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
spin_unlock_irq(&ndlp->lock);
lpfc_disc_state_machine(vport, ndlp, cmdiocb,
NLP_EVT_DEVICE_RM);
lpfc_els_free_iocb(phba, cmdiocb);
lpfc_nlp_put(ndlp);
/* Presume the node was released. */
return;
goto out_rsrc_free;
}
out:
/* Driver is done with the IO. */
lpfc_els_free_iocb(phba, cmdiocb);
lpfc_nlp_put(ndlp);
/* At this point, the LOGO processing is complete. NOTE: For a
* pt2pt topology, we are assuming the NPortID will only change
* on link up processing. For a LOGO / PLOGI initiated by the
@ -3059,6 +3048,10 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
ndlp->nlp_DID, ulp_status,
ulp_word4, tmo,
vport->num_disc_nodes);
lpfc_els_free_iocb(phba, cmdiocb);
lpfc_nlp_put(ndlp);
lpfc_disc_start(vport);
return;
}
@ -3075,6 +3068,10 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
lpfc_disc_state_machine(vport, ndlp, cmdiocb,
NLP_EVT_DEVICE_RM);
}
out_rsrc_free:
/* Driver is done with the I/O. */
lpfc_els_free_iocb(phba, cmdiocb);
lpfc_nlp_put(ndlp);
}
/**