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Message-Id: <20211109221641.1233217-68-sashal@kernel.org>
Date: Tue, 9 Nov 2021 17:16:26 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: James Smart <jsmart2021@...il.com>,
Justin Tee <justin.tee@...adcom.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
Sasha Levin <sashal@...nel.org>, james.smart@...gotech.com,
dick.kennedy@...gotech.com, JBottomley@...n.com,
linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 68/82] scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine
From: James Smart <jsmart2021@...il.com>
[ Upstream commit 79b20beccea3a3938a8500acef4e6b9d7c66142f ]
An error is detected with the following report when unloading the driver:
"KASAN: use-after-free in lpfc_unreg_rpi+0x1b1b"
The NLP_REG_LOGIN_SEND nlp_flag is set in lpfc_reg_fab_ctrl_node(), but the
flag is not cleared upon completion of the login.
This allows a second call to lpfc_unreg_rpi() to proceed with nlp_rpi set
to LPFC_RPI_ALLOW_ERROR. This results in a use after free access when used
as an rpi_ids array index.
Fix by clearing the NLP_REG_LOGIN_SEND nlp_flag in
lpfc_mbx_cmpl_fc_reg_login().
Link: https://lore.kernel.org/r/20211020211417.88754-5-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@...adcom.com>
Signed-off-by: Justin Tee <justin.tee@...adcom.com>
Signed-off-by: James Smart <jsmart2021@...il.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/scsi/lpfc/lpfc_hbadisc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 7195ca0275f93..787898d25670d 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -4360,6 +4360,7 @@ lpfc_mbx_cmpl_fc_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
ndlp->nlp_state);
ndlp->nlp_flag |= NLP_RPI_REGISTERED;
+ ndlp->nlp_flag &= ~NLP_REG_LOGIN_SEND;
ndlp->nlp_type |= NLP_FABRIC;
lpfc_nlp_set_state(vport, ndlp, NLP_STE_UNMAPPED_NODE);
--
2.33.0
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