From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 25 Jan 2021 11:44:34 +0300
Subject: scsi: lpfc: Fix ancient double free
Patch-mainline: v5.12-rc1
Git-commit: 0be310979e5e1272d4c5b557642df4da4ce7eba4
References: bsc#1182574
The "pmb" pointer is freed at the start of the function and then freed
again in the error handling code.
Link: https://lore.kernel.org/r/YA6E8rO51hE56SVw@mwanda
Fixes: 92d7f7b0cde3 ("[SCSI] lpfc: NPIV: add NPIV support on top of SLI-3")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
drivers/scsi/lpfc/lpfc_hbadisc.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -1151,13 +1151,14 @@ lpfc_mbx_cmpl_local_config_link(struct l
struct lpfc_vport *vport = pmb->vport;
LPFC_MBOXQ_t *sparam_mb;
struct lpfc_dmabuf *sparam_mp;
+ u16 status = pmb->u.mb.mbxStatus;
int rc;
- if (pmb->u.mb.mbxStatus)
- goto out;
-
mempool_free(pmb, phba->mbox_mem_pool);
+ if (status)
+ goto out;
+
/* don't perform discovery for SLI4 loopback diagnostic test */
if ((phba->sli_rev == LPFC_SLI_REV4) &&
!(phba->hba_flag & HBA_FCOE_MODE) &&
@@ -1220,12 +1221,10 @@ lpfc_mbx_cmpl_local_config_link(struct l
out:
lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
- "0306 CONFIG_LINK mbxStatus error x%x "
- "HBA state x%x\n",
- pmb->u.mb.mbxStatus, vport->port_state);
-sparam_out:
- mempool_free(pmb, phba->mbox_mem_pool);
+ "0306 CONFIG_LINK mbxStatus error x%x HBA state x%x\n",
+ status, vport->port_state);
+sparam_out:
lpfc_linkdown(phba);
lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,