linux-kernel - [PATCH] [v2] scsi: megaraid_sas: Fix a memleak in megasas_init

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Date: Tue, 23 Jan 2024 01:16:10 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
	Chandrakanth patil <chandrakanth.patil@...adcom.com>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	megaraidlinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] scsi: megaraid_sas: Fix a memleak in megasas_init_fw

In the error-handling paths after allocation of
fusion->stream_detect_by_ld and fusion->stream_detect_by_ld[i],
megasas_init_fw should free them or there would be memleaks.

Fixes: 2e47e4e62e40 ("scsi: megaraid_sas: Fail init if heartbeat timer fails")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
Changelog:

v2: remove the unused variable j.
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 3d4f13da1ae8..a7d3c51fc17b 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -6016,7 +6016,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 	void *base_addr_phys;
 	struct megasas_ctrl_info *ctrl_info = NULL;
 	unsigned long bar_list;
-	int i, j, loop;
+	int i, loop;
 	struct IOV_111 *iovPtr;
 	struct fusion_context *fusion;
 	bool intr_coalescing;
@@ -6378,11 +6378,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 			if (!fusion->stream_detect_by_ld[i]) {
 				dev_err(&instance->pdev->dev,
 					"unable to allocate stream detect by LD\n ");
-				for (j = 0; j < i; ++j)
-					kfree(fusion->stream_detect_by_ld[j]);
-				kfree(fusion->stream_detect_by_ld);
-				fusion->stream_detect_by_ld = NULL;
-				goto fail_get_ld_pd_list;
+				goto fail_alloc_stream_detect;
 			}
 			fusion->stream_detect_by_ld[i]->mru_bit_map
 				= MR_STREAM_BITMAP;
@@ -6502,7 +6498,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 			megasas_start_timer(instance);
 		} else {
 			instance->skip_heartbeat_timer_del = 1;
-			goto fail_get_ld_pd_list;
+			goto fail_alloc_stream_detect;
 		}
 	}
 
@@ -6520,6 +6516,13 @@ static int megasas_init_fw(struct megasas_instance *instance)
 fail_start_watchdog:
 	if (instance->requestorId && !instance->skip_heartbeat_timer_del)
 		del_timer_sync(&instance->sriov_heartbeat_timer);
+fail_alloc_stream_detect:
+	if (instance->adapter_type >= VENTURA_SERIES) {
+		for (i = 0; i < MAX_LOGICAL_DRIVES_EXT; ++i)
+			kfree(fusion->stream_detect_by_ld[i]);
+		kfree(fusion->stream_detect_by_ld);
+		fusion->stream_detect_by_ld = NULL;
+	}
 fail_get_ld_pd_list:
 	instance->instancet->disable_intr(instance);
 	megasas_destroy_irqs(instance);
-- 
2.34.1