linux-kernel - Re: [PATCH 7/8] drivers/dma: introduce missing kfree

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Date:	Sat, 21 Nov 2009 14:21:12 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	maciej.sosnowski@...el.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Nobuhiro Iwamatsu <iwamatsu.nobuhiro@...esas.com>
Subject: Re: [PATCH 7/8] drivers/dma: introduce missing kfree

On Sat, Nov 21, 2009 at 4:52 AM, Julia Lawall <julia@...u.dk> wrote:
> From: Julia Lawall <julia@...u.dk>
>
> Error handling code following a kzalloc should free the allocated data.
>

Yes, but there is another buglet here:

>        /* get platform data */
>        if (!pdev->dev.platform_data)
> -               goto shdev_err;
> +               goto platform_err;

"err" is still zero at this point so the probe does not fail.

How about the following instead?

diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index b3b065c..034ecf0 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -640,17 +640,16 @@ static int __init sh_dmae_probe(struct
platform_device *pdev)
 #endif
        struct sh_dmae_device *shdev;

+       /* get platform data */
+       if (!pdev->dev.platform_data)
+               return -ENODEV;
+
        shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
        if (!shdev) {
                dev_err(&pdev->dev, "No enough memory\n");
-               err = -ENOMEM;
-               goto shdev_err;
+               return -ENOMEM;
        }

-       /* get platform data */
-       if (!pdev->dev.platform_data)
-               goto shdev_err;
-
        /* platform data */
        memcpy(&shdev->pdata, pdev->dev.platform_data,
                        sizeof(struct sh_dmae_pdata));
@@ -722,7 +721,6 @@ eirq_err:
 rst_err:
        kfree(shdev);

-shdev_err:
        return err;
 }
--
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