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From:   Wong Vee Khee <vee.khee.wong@linux.intel.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc:     Ong Boon Leong <boon.leong.ong@intel.com>, netdev@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next 1/1] net: stmmac: fix memory leak during driver probe
Date:   Mon, 19 Apr 2021 19:25:30 +0800
Message-Id: <20210419112530.20395-1-vee.khee.wong@linux.intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

On driver probe, kmemleak reported the following memory leak which was
due to allocated bitmap that was not being freed in stmmac_dvr_probe().

unreferenced object 0xffff9276014b13c0 (size 8):
  comm "systemd-udevd", pid 2143, jiffies 4294681112 (age 116.720s)
  hex dump (first 8 bytes):
    00 00 00 00 00 00 00 00                          ........
  backtrace:
    [<00000000c51e34b2>] stmmac_dvr_probe+0x1c0/0x440 [stmmac]
    [<00000000b530eb41>] intel_eth_pci_probe.cold+0x2b/0x14e [dwmac_intel]
    [<00000000b10f8929>] pci_device_probe+0xd2/0x150
    [<00000000fb254c74>] really_probe+0xf8/0x410
    [<0000000034128a59>] driver_probe_device+0x5d/0x150
    [<00000000016104d5>] device_driver_attach+0x53/0x60
    [<00000000cb18cd07>] __driver_attach+0x96/0x140
    [<00000000da9ffd5c>] bus_for_each_dev+0x7a/0xc0
    [<00000000af061a88>] bus_add_driver+0x184/0x1f0
    [<000000008be5c1c5>] driver_register+0x6c/0xc0
    [<0000000052b18a9e>] do_one_initcall+0x4d/0x210
    [<00000000154d4f07>] do_init_module+0x5c/0x230
    [<000000009b648d09>] load_module+0x2a5a/0x2d40
    [<000000000d86b76d>] __do_sys_finit_module+0xb5/0x120
    [<000000002b0cef95>] do_syscall_64+0x33/0x40
    [<0000000067b45bbb>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: bba2556efad6 ("net: stmmac: Enable RX via AF_XDP zero-copy")
Cc: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Wong Vee Khee <vee.khee.wong@linux.intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 9f396648d76f..d1ca07c846e6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7035,6 +7035,7 @@ int stmmac_dvr_probe(struct device *device,
 error_hw_init:
 	destroy_workqueue(priv->wq);
 	stmmac_bus_clks_config(priv, false);
+	bitmap_free(priv->af_xdp_zc_qps);
 
 	return ret;
 }
@@ -7077,6 +7078,7 @@ int stmmac_dvr_remove(struct device *dev)
 		stmmac_mdio_unregister(ndev);
 	destroy_workqueue(priv->wq);
 	mutex_destroy(&priv->lock);
+	bitmap_free(priv->af_xdp_zc_qps);
 
 	return 0;
 }
-- 
2.25.1