netdev - [PATCH] net: thunderx: Fix the ACPI memory leak

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Message-ID: <20221123082237.1220521-1-liaoyu15@huawei.com>
Date:   Wed, 23 Nov 2022 16:22:36 +0800
From:   Yu Liao <liaoyu15@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <david.daney@...ium.com>,
        <tomasz.nowicki@...aro.org>, <rrichter@...ium.com>
CC:     <liaoyu15@...wei.com>, <liwei391@...wei.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH] net: thunderx: Fix the ACPI memory leak

The ACPI buffer memory (string.pointer) should be freed as the buffer is
not used after returning from bgx_acpi_match_id(), free it to prevent
memory leak.

Fixes: 46b903a01c05 ("net, thunder, bgx: Add support to get MAC address from ACPI.")
Signed-off-by: Yu Liao <liaoyu15@...wei.com>
---
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index 2f6484dc186a..7eb2ddbe9bad 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1436,8 +1436,10 @@ static acpi_status bgx_acpi_match_id(acpi_handle handle, u32 lvl,
 		return AE_OK;
 	}
 
-	if (strncmp(string.pointer, bgx_sel, 4))
+	if (strncmp(string.pointer, bgx_sel, 4)) {
+		kfree(string.pointer);
 		return AE_OK;
+	}
 
 	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
 			    bgx_acpi_register_phy, NULL, bgx, NULL);
-- 
2.25.1