Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.13 09/88] scsi: lpfc: Fix NULL ptr dereference with NPIV ports for RDF handling | Date | Thu, 9 Sep 2021 20:17:01 -0400 |
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From: James Smart <jsmart2021@gmail.com>
[ Upstream commit 2d338eb55b14ab9d245e8b1d982adecca8c4c613 ]
RDF ELS handling for NPIV ports may result in an incorrect NDLP reference count. In the event of a persistent link down, this may lead to premature release of an NDLP structure and subsequent NULL ptr dereference panic.
Remove extraneous lpfc_nlp_put() call in NPIV port RDF processing.
Link: https://lore.kernel.org/r/20210707184351.67872-9-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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/scsi/lpfc/lpfc_els.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 933927f738c7..6e7b81184db3 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -3267,7 +3267,6 @@ lpfc_issue_els_scr(struct lpfc_vport *vport, uint8_t retry) return 1; } - /* Keep the ndlp just in case RDF is being sent */ return 0; } @@ -3511,11 +3510,9 @@ lpfc_issue_els_rdf(struct lpfc_vport *vport, uint8_t retry) lpfc_enqueue_node(vport, ndlp); } - /* RDF ELS is not required on an NPIV VN_Port. */ - if (vport->port_type == LPFC_NPIV_PORT) { - lpfc_nlp_put(ndlp); + /* RDF ELS is not required on an NPIV VN_Port. */ + if (vport->port_type == LPFC_NPIV_PORT) return -EACCES; - } elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp, ndlp->nlp_DID, ELS_CMD_RDF); -- 2.30.2
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