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scsi: lpfc: Fix use-after-free mailbox cmd completion

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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>
This commit is contained in:
James Smart 2019-03-12 16:30:06 -07:00 committed by Martin K. Petersen
parent 50e3f871fb
commit 9b16406864
2 changed files with 5 additions and 1 deletions
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4
drivers/scsi/lpfc/lpfc_hbadisc.c
View file

@ -4868,6 +4868,10 @@ 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 =

2
drivers/scsi/lpfc/lpfc_sli.c
View file

@ -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 */