linux-kernel - [PATCH 1/2] scsi: message: fusion: Improve data processing in mptsas_find_phyinfo_by_phys_disk

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Date: Wed, 27 Dec 2023 11:04:53 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: linux-scsi@...r.kernel.org, MPT-FusionLinux.pdl@...adcom.com,
 kernel-janitors@...r.kernel.org, Sathya Prakash
 <sathya.prakash@...adcom.com>, Sreekanth Reddy
 <sreekanth.reddy@...adcom.com>,
 Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: [PATCH 1/2] scsi: message: fusion: Improve data processing in
 mptsas_find_phyinfo_by_phys_disk_num()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 27 Dec 2023 10:23:09 +0100

The kfree() function was called in one case by the
mptsas_find_phyinfo_by_phys_disk_num() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

1. Thus use another label.

2. Delete an initialisation for the variable “phys_disk”
   which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/message/fusion/mptsas.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 300f8e955a53..452635a50c4c 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -4171,7 +4171,7 @@ mptsas_find_phyinfo_by_phys_disk_num(MPT_ADAPTER *ioc, u8 phys_disk_num,
 {
 	struct mptsas_phyinfo *phy_info = NULL;
 	struct mptsas_portinfo *port_info;
-	RaidPhysDiskPage1_t *phys_disk = NULL;
+	RaidPhysDiskPage1_t *phys_disk;
 	int num_paths;
 	u64 sas_address = 0;
 	int i;
@@ -4182,11 +4182,13 @@ mptsas_find_phyinfo_by_phys_disk_num(MPT_ADAPTER *ioc, u8 phys_disk_num,
 	/* dual port support */
 	num_paths = mpt_raid_phys_disk_get_num_paths(ioc, phys_disk_num);
 	if (!num_paths)
-		goto out;
+		goto lock_mutex;
+
 	phys_disk = kzalloc(offsetof(RaidPhysDiskPage1_t, Path) +
 	   (num_paths * sizeof(RAID_PHYS_DISK1_PATH)), GFP_KERNEL);
 	if (!phys_disk)
-		goto out;
+		goto lock_mutex;
+
 	mpt_raid_phys_disk_pg1(ioc, phys_disk_num, phys_disk);
 	for (i = 0; i < num_paths; i++) {
 		if ((phys_disk->Path[i].Flags & 1) != 0)
@@ -4211,6 +4213,7 @@ mptsas_find_phyinfo_by_phys_disk_num(MPT_ADAPTER *ioc, u8 phys_disk_num,
 	 * Extra code to handle RAID0 case, where the sas_address is not updated
 	 * in phys_disk_page_1 when hotswapped
 	 */
+lock_mutex:
 	mutex_lock(&ioc->sas_topology_mutex);
 	list_for_each_entry(port_info, &ioc->sas_topology, list) {
 		for (i = 0; i < port_info->num_phys && !phy_info; i++) {
--
2.43.0