linux-kernel - [PATCH] scsi: libsas: use _safe() loop in sas_resume

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Date:   Wed, 19 May 2021 17:20:27 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Jacek Danecki <jacek.danecki@...el.com>,
        James Bottomley <JBottomley@...allels.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] scsi: libsas: use _safe() loop in sas_resume_port()

If sas_notify_lldd_dev_found() fails then this code calls:

	sas_unregister_dev(port, dev);

which removes "dev", our list iterator, from the list.  This could
lead to an endless loop.  We need to use list_for_each_entry_safe().

Fixes: 303694eeee5e ("[SCSI] libsas: suspend / resume support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/scsi/libsas/sas_port.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index 19cf418928fa..e3d03d744713 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -25,7 +25,7 @@ static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy
 
 static void sas_resume_port(struct asd_sas_phy *phy)
 {
-	struct domain_device *dev;
+	struct domain_device *dev, *n;
 	struct asd_sas_port *port = phy->port;
 	struct sas_ha_struct *sas_ha = phy->ha;
 	struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
@@ -44,7 +44,7 @@ static void sas_resume_port(struct asd_sas_phy *phy)
 	 * 1/ presume every device came back
 	 * 2/ force the next revalidation to check all expander phys
 	 */
-	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+	list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
 		int i, rc;
 
 		rc = sas_notify_lldd_dev_found(dev);
-- 
2.30.2