[PATCH 4.19 327/346] scsi: lpfc: Re-fix use after free in lpfc_rq_buf_free()

Greg Kroah-Hartman
2020-12-28T13:36:30Z

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++;