linux-kernel - [PATCH] scsi: pm8001: Fix memory leak in pm8001_send_abort

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Date:   Tue, 14 Dec 2021 17:03:37 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     jinpu.wang@...ud.ionos.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] scsi: pm8001: Fix memory leak in pm8001_send_abort_all()

In line 1767, sas_alloc_slow_task() allocates and initializes a
sas_task structure. When some errors occur, line 1778 and line
1795 forget to free this structure, which will lead to a memory leak.
There is a similar snippet of code in the same file (in function
pm8001_send_read_log) as allocating and initializing in line 1812
as well as releasing the memory in line 1822 and line 1867.

We can fix it by calling sas_free_task() when the res and ret is true
and before the function returns.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/scsi/pm8001/pm8001_hwi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index 124cb69740c6..25045a91620e 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -1774,8 +1774,10 @@ static void pm8001_send_abort_all(struct pm8001_hba_info *pm8001_ha,
 	task->task_done = pm8001_task_done;
 
 	res = pm8001_tag_alloc(pm8001_ha, &ccb_tag);
-	if (res)
+	if (res) {
+		sas_free_task(task);
 		return;
+	}
 
 	ccb = &pm8001_ha->ccb_info[ccb_tag];
 	ccb->device = pm8001_ha_dev;
@@ -1791,8 +1793,10 @@ static void pm8001_send_abort_all(struct pm8001_hba_info *pm8001_ha,
 
 	ret = pm8001_mpi_build_cmd(pm8001_ha, circularQ, opc, &task_abort,
 			sizeof(task_abort), 0);
-	if (ret)
+	if (ret) {
+		sas_free_task(task);
 		pm8001_tag_free(pm8001_ha, ccb_tag);
+	}
 
 }
 
-- 
2.25.1