From: James Smart Date: Wed, 20 Oct 2021 21:14:13 +0000 (-0700) Subject: scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=79b20beccea3a3938a8500acef4e6b9d7c66142f;p=linux.git scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine 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 Signed-off-by: Justin Tee Signed-off-by: James Smart Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 0b1e1cc00e019..4c068fbb550af 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -4372,6 +4372,7 @@ 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);