linux-kernel - [PATCH v2] scsi: ufs: ufshpb: Fix possible memory leak

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Date:   Mon, 23 Aug 2021 18:07:14 +0900
From:   Keoseong Park <keosung.park@...sung.com>
To:     ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Daejun Park <daejun7.park@...sung.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] scsi: ufs: ufshpb: Fix possible memory leak

When HPB pinned region exists and mctx allocation for this region fails,
memory leak is possible because memory is not released for the subregion
table of the current region.

So, change to free memory for the subregion table of the current region.

Signed-off-by: Keoseong Park <keosung.park@...sung.com>
---
v1 -> v2:
	* Merge new kvfree() statement with the for-loop below it.
	* Change to assign "hpb->rgn_tbl" when no error occurs.

 drivers/scsi/ufs/ufshpb.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 9acce92a356b..58db9ab8f0ae 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -1904,8 +1904,6 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
 	if (!rgn_table)
 		return -ENOMEM;
 
-	hpb->rgn_tbl = rgn_table;
-
 	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
 		int srgn_cnt = hpb->srgns_per_rgn;
 		bool last_srgn = false;
@@ -1942,10 +1940,12 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
 		rgn->hpb = hpb;
 	}
 
+	hpb->rgn_tbl = rgn_table;
+
 	return 0;
 
 release_srgn_table:
-	for (i = 0; i < rgn_idx; i++)
+	for (i = 0; i <= rgn_idx; i++)
 		kvfree(rgn_table[i].srgn_tbl);
 
 	kvfree(rgn_table);
-- 
2.17.1