linux-kernel - [PATCH v2] sdio: Fix a memory leaking bug in wl1271

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Message-ID: <20190523144425.GA26766@zhanggen-UX430UQ>
Date:   Thu, 23 May 2019 22:44:25 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     kvalo@...eaurora.org, eyalreizer@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] sdio: Fix a memory leaking bug in wl1271_probe()

In wl1271_probe(), 'glue->core' is allocated by platform_device_alloc(),
when this allocation fails, ENOMEM is returned. However, 'pdev_data'
and 'glue' are allocated by devm_kzalloc() before 'glue->core'. When
platform_device_alloc() returns NULL, we should also free 'pdev_data'
and 'glue' before wl1271_probe() ends to prevent leaking memory.

Similarly, we should free 'pdev_data' when 'glue' is NULL. And we
should free 'pdev_data' and 'glue' when 'ret' is error.

Further, we shoulf free 'glue->dev', 'pdev_data' and 'glue' when this
function normally ends to prevent memory leaking.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
---
diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
index 4d4b0770..232ce5f 100644
--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -298,8 +298,10 @@ static int wl1271_probe(struct sdio_func *func,
 	pdev_data->if_ops = &sdio_ops;
 
 	glue = devm_kzalloc(&func->dev, sizeof(*glue), GFP_KERNEL);
-	if (!glue)
-		return -ENOMEM;
+	if (!glue) {
+		ret = -ENOMEM;
+		goto out_free1;
+	}
 
 	glue->dev = &func->dev;
 
@@ -311,7 +313,7 @@ static int wl1271_probe(struct sdio_func *func,
 
 	ret = wlcore_probe_of(&func->dev, &irq, &wakeirq, pdev_data);
 	if (ret)
-		goto out;
+		goto out_free2;
 
 	/* if sdio can keep power while host is suspended, enable wow */
 	mmcflags = sdio_get_host_pm_caps(func);
@@ -340,7 +342,7 @@ static int wl1271_probe(struct sdio_func *func,
 	if (!glue->core) {
 		dev_err(glue->dev, "can't allocate platform_device");
 		ret = -ENOMEM;
-		goto out;
+		goto out_free2;
 	}
 
 	glue->core->dev.parent = &func->dev;
@@ -380,11 +382,20 @@ static int wl1271_probe(struct sdio_func *func,
 		dev_err(glue->dev, "can't add platform device\n");
 		goto out_dev_put;
 	}
+	platform_device_put(glue->core);
+	devm_kfree(&func->dev, glue);
+	devm_kfree(&func->dev, pdev_data);
 	return 0;
 
 out_dev_put:
 	platform_device_put(glue->core);
 
+out_free2:
+	devm_kfree(&func->dev, glue);
+
+out_free1:
+	devm_kfree(&func->dev, pdev_data);
+
 out:
 	return ret;
 }
---