From: James Smart james.smart@broadcom.com
commit e5785d3ec32f5f44dd88cd7b398e496742630469 upstream.
Commit 9816ef6ecbc1 ("scsi: lpfc: Use after free in lpfc_rq_buf_free()") was made to correct a use after free condition in lpfc_rq_buf_free(). Unfortunately, a subsequent patch cut on a tree without the fix inadvertently reverted the fix.
Put the fix back: Move the freeing of the rqb_entry to after the print function that references it.
Link: https://lore.kernel.org/r/20201020202719.54726-4-james.smart@broadcom.com Fixes: 411de511c694 ("scsi: lpfc: Fix RQ empty firmware trap") Cc: stable@vger.kernel.org # v4.17+ Signed-off-by: James Smart james.smart@broadcom.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/lpfc/lpfc_mem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/scsi/lpfc/lpfc_mem.c +++ b/drivers/scsi/lpfc/lpfc_mem.c @@ -752,7 +752,6 @@ lpfc_rq_buf_free(struct lpfc_hba *phba, drqe.address_hi = putPaddrHigh(rqb_entry->dbuf.phys); rc = lpfc_sli4_rq_put(rqb_entry->hrq, rqb_entry->drq, &hrqe, &drqe); if (rc < 0) { - (rqbp->rqb_free_buffer)(phba, rqb_entry); lpfc_printf_log(phba, KERN_ERR, LOG_INIT, "6409 Cannot post to HRQ %d: %x %x %x " "DRQ %x %x\n", @@ -762,6 +761,7 @@ lpfc_rq_buf_free(struct lpfc_hba *phba, rqb_entry->hrq->entry_count, rqb_entry->drq->host_index, rqb_entry->drq->hba_index); + (rqbp->rqb_free_buffer)(phba, rqb_entry); } else { list_add_tail(&rqb_entry->hbuf.list, &rqbp->rqb_buffer_list); rqbp->buffer_count++;