wlcore: fix usage of platform_device_add_data()

Coverity CID 986698 reports leakage of struct wlcore_platdev_data in the
probe functions of both the SPI/SDIO interfaces. The structure passed to
platform_device_add_data() is dynamically allocated and only freed in the
error paths, however, platform_device_add_data() adds a copy of the platform
specific data to the device. Move the temporary struct that is kmemdup'ed
to the stack. This issue exists since afb43e6d (wlcore: remove if_ops from
platform_data).

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
index 29ef249..d3dd7bf 100644 (file)
--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -217,7 +217,7 @@ static struct wl1271_if_operations sdio_ops = {
 static int wl1271_probe(struct sdio_func *func,
                                  const struct sdio_device_id *id)
 {
-       struct wlcore_platdev_data *pdev_data;
+       struct wlcore_platdev_data pdev_data;
        struct wl12xx_sdio_glue *glue;
        struct resource res[1];
        mmc_pm_flag_t mmcflags;
@@ -228,16 +228,13 @@ static int wl1271_probe(struct sdio_func *func,
        if (func->num != 0x02)
                return -ENODEV;
 
-       pdev_data = kzalloc(sizeof(*pdev_data), GFP_KERNEL);
-       if (!pdev_data)
-               goto out;
-
-       pdev_data->if_ops = &sdio_ops;
+       memset(&pdev_data, 0x00, sizeof(pdev_data));
+       pdev_data.if_ops = &sdio_ops;
 
        glue = kzalloc(sizeof(*glue), GFP_KERNEL);
        if (!glue) {
                dev_err(&func->dev, "can't allocate glue\n");
-               goto out_free_pdev_data;
+               goto out;
        }
 
        glue->dev = &func->dev;
@@ -248,9 +245,9 @@ static int wl1271_probe(struct sdio_func *func,
        /* Use block mode for transferring over one block size of data */
        func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
 
-       pdev_data->pdata = wl12xx_get_platform_data();
-       if (IS_ERR(pdev_data->pdata)) {
-               ret = PTR_ERR(pdev_data->pdata);
+       pdev_data.pdata = wl12xx_get_platform_data();
+       if (IS_ERR(pdev_data.pdata)) {
+               ret = PTR_ERR(pdev_data.pdata);
                dev_err(glue->dev, "missing wlan platform data: %d\n", ret);
                goto out_free_glue;
        }
@@ -260,7 +257,7 @@ static int wl1271_probe(struct sdio_func *func,
        dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);
 
        if (mmcflags & MMC_PM_KEEP_POWER)
-               pdev_data->pdata->pwr_in_suspend = true;
+               pdev_data.pdata->pwr_in_suspend = true;
 
        sdio_set_drvdata(func, glue);
 
@@ -289,7 +286,7 @@ static int wl1271_probe(struct sdio_func *func,
 
        memset(res, 0x00, sizeof(res));
 
-       res[0].start = pdev_data->pdata->irq;
+       res[0].start = pdev_data.pdata->irq;
        res[0].flags = IORESOURCE_IRQ;
        res[0].name = "irq";
 
@@ -299,8 +296,8 @@ static int wl1271_probe(struct sdio_func *func,
                goto out_dev_put;
        }
 
-       ret = platform_device_add_data(glue->core, pdev_data,
-                                      sizeof(*pdev_data));
+       ret = platform_device_add_data(glue->core, &pdev_data,
+                                      sizeof(pdev_data));
        if (ret) {
                dev_err(glue->dev, "can't add platform data\n");
                goto out_dev_put;
@@ -319,9 +316,6 @@ out_dev_put:
 out_free_glue:
        kfree(glue);
 
-out_free_pdev_data:
-       kfree(pdev_data);
-
 out:
        return ret;
 }

diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
index dbe826d..5f3a389 100644 (file)
--- a/drivers/net/wireless/ti/wlcore/spi.c
+++ b/drivers/net/wireless/ti/wlcore/spi.c
@@ -327,27 +327,25 @@ static struct wl1271_if_operations spi_ops = {
 static int wl1271_probe(struct spi_device *spi)
 {
        struct wl12xx_spi_glue *glue;
-       struct wlcore_platdev_data *pdev_data;
+       struct wlcore_platdev_data pdev_data;
        struct resource res[1];
        int ret = -ENOMEM;
 
-       pdev_data = kzalloc(sizeof(*pdev_data), GFP_KERNEL);
-       if (!pdev_data)
-               goto out;
+       memset(&pdev_data, 0x00, sizeof(pdev_data));
 
-       pdev_data->pdata = dev_get_platdata(&spi->dev);
-       if (!pdev_data->pdata) {
+       pdev_data.pdata = dev_get_platdata(&spi->dev);
+       if (!pdev_data.pdata) {
                dev_err(&spi->dev, "no platform data\n");
                ret = -ENODEV;
-               goto out_free_pdev_data;
+               goto out;
        }
 
-       pdev_data->if_ops = &spi_ops;
+       pdev_data.if_ops = &spi_ops;
 
        glue = kzalloc(sizeof(*glue), GFP_KERNEL);
        if (!glue) {
                dev_err(&spi->dev, "can't allocate glue\n");
-               goto out_free_pdev_data;
+               goto out;
        }
 
        glue->dev = &spi->dev;
@@ -385,8 +383,8 @@ static int wl1271_probe(struct spi_device *spi)
                goto out_dev_put;
        }
 
-       ret = platform_device_add_data(glue->core, pdev_data,
-                                      sizeof(*pdev_data));
+       ret = platform_device_add_data(glue->core, &pdev_data,
+                                      sizeof(pdev_data));
        if (ret) {
                dev_err(glue->dev, "can't add platform data\n");
                goto out_dev_put;
@@ -406,9 +404,6 @@ out_dev_put:
 out_free_glue:
        kfree(glue);
 
-out_free_pdev_data:
-       kfree(pdev_data);
-
 out:
        return ret;
 }