From: Justin Tee justin.tee@broadcom.com

mainline inclusion from mainline-v6.12-rc1 commit 2be1d4f11944cd6283cb97268b3e17c4424945ca category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYR9Z CVE: CVE-2024-49891

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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When the HBA is undergoing a reset or is handling an errata event, NULL ptr dereference crashes may occur in routines such as lpfc_sli_flush_io_rings(), lpfc_dev_loss_tmo_callbk(), or lpfc_abort_handler().

Add NULL ptr checks before dereferencing hdwq pointers that may have been freed due to operations colliding with a reset or errata event handler.

Signed-off-by: Justin Tee justin.tee@broadcom.com Link: https://lore.kernel.org/r/20240726231512.92867-4-justintee8345@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Conflicts: drivers/scsi/lpfc/lpfc.h drivers/scsi/lpfc/lpfc_hbadisc.c drivers/scsi/lpfc/lpfc_scsi.c drivers/scsi/lpfc/lpfc_sli.c [Yongqiang: add HBA_SETUP flag from commit 02243836ad6f("scsi: lpfc: Add support for the CM framework") for teardown logic] Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/scsi/lpfc/lpfc.h | 1 + drivers/scsi/lpfc/lpfc_hbadisc.c | 3 ++- drivers/scsi/lpfc/lpfc_scsi.c | 13 +++++++++++-- drivers/scsi/lpfc/lpfc_sli.c | 15 +++++++++++++++ 4 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index cf69f831a725..103ff1ce2aef 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -772,6 +772,7 @@ struct lpfc_hba { */ #define HBA_FLOGI_ISSUED 0x100000 /* FLOGI was issued */ #define HBA_DEFER_FLOGI 0x800000 /* Defer FLOGI till read_sparm cmpl */ +#define HBA_SETUP 0x1000000 /* Signifies HBA setup is completed */

struct completion *fw_dump_cmpl; /* cmpl event tracker for fw_dump */ uint32_t fcp_ring_in_use; /* When polling test if intr-hndlr active*/ diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index d1f28364356e..5d8f3797b1b6 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -140,7 +140,8 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport) * or unloading the driver. The unload will cleanup the node * appropriately we just need to cleanup the ndlp rport info here. */ - if (vport->load_flag & FC_UNLOADING) { + if (vport->load_flag & FC_UNLOADING || + !(phba->hba_flag & HBA_SETUP)) { put_node = rdata->pnode != NULL; put_rport = ndlp->rport != NULL; rdata->pnode = NULL; diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index 983eeb0e3d07..2d2276aa0b63 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -4769,11 +4769,20 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)

iocb = &lpfc_cmd->cur_iocbq; if (phba->sli_rev == LPFC_SLI_REV4) { - pring_s4 = phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring; - if (!pring_s4) { + /* if the io_wq & pring are gone, the port was reset. */ + if (!phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq || + !phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring) { + lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP, + "2877 SCSI Layer I/O Abort Request " + "IO CMPL Status x%x ID %d LUN %llu " + "HBA_SETUP %d\n", FAILED, + cmnd->device->id, + (u64)cmnd->device->lun, + phba->hba_flag & HBA_SETUP); ret = FAILED; goto out_unlock_buf; } + pring_s4 = phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring; spin_lock(&pring_s4->ring_lock); } /* the command is in process of being cancelled */ diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 28fee498a3d2..e6f6ddc80ee5 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -4156,6 +4156,17 @@ lpfc_sli_flush_io_rings(struct lpfc_hba *phba) /* Look on all the FCP Rings for the iotag */ if (phba->sli_rev >= LPFC_SLI_REV4) { for (i = 0; i < phba->cfg_hdw_queue; i++) { + if (!phba->sli4_hba.hdwq || + !phba->sli4_hba.hdwq[i].io_wq) { + lpfc_printf_log(phba, KERN_ERR, LOG_SLI, + "7777 hdwq's deleted %x " + "%x %x %x\n", + phba->pport->load_flag, + phba->hba_flag, + phba->link_state, + phba->sli.sli_flag); + return; + } pring = phba->sli4_hba.hdwq[i].io_wq->pring;

spin_lock_irq(&pring->ring_lock); @@ -4304,6 +4315,7 @@ lpfc_sli_brdready_s4(struct lpfc_hba *phba, uint32_t mask) } else phba->sli4_hba.intr_enable = 0;

+ phba->hba_flag &= ~HBA_SETUP; return retval; }

@@ -4623,6 +4635,7 @@ lpfc_sli4_brdreset(struct lpfc_hba *phba) phba->link_events = 0; phba->pport->fc_myDID = 0; phba->pport->fc_prevDID = 0; + phba->hba_flag &= ~HBA_SETUP;

spin_lock_irq(&phba->hbalock); psli->sli_flag &= ~(LPFC_PROCESS_LA); @@ -7989,6 +8002,8 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phba) } } mempool_free(mboxq, phba->mbox_mem_pool); + + phba->hba_flag |= HBA_SETUP; return rc; out_io_buff_free: /* Free allocated IO Buffers */