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Message-Id: <1248828809.2670.144.camel@rzhang-dt>
Date: Wed, 29 Jul 2009 08:53:29 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Julia Lawall <julia@...u.dk>
Cc: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 9/9] drivers/acpi: correct error-handling code
On Tue, 2009-07-28 at 23:56 +0800, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
>
> backlight_device_register may return an ERR_PTR value rather than a valid
> pointer.
>
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> Signed-off-by: Julia Lawall <julia@...u.dk>
>
> ---
> drivers/acpi/video.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> index 8851315..29788db 100644
> --- a/drivers/acpi/video.c
> +++ b/drivers/acpi/video.c
> @@ -982,6 +982,8 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
> sprintf(name, "acpi_video%d", count++);
> device->backlight = backlight_device_register(name,
> NULL, device, &acpi_backlight_ops);
> + if (IS_ERR(device->backlight))
> + return;
we should kfree(name) here.
> device->backlight->props.max_brightness = device->brightness->count-3;
> kfree(name);
how about this one?
backlight_device_register may return an ERR_PTR value rather than a valid
pointer.
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
drivers/acpi/video.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/acpi/video.c
===================================================================
--- linux-2.6.orig/drivers/acpi/video.c
+++ linux-2.6/drivers/acpi/video.c
@@ -982,8 +982,10 @@ static void acpi_video_device_find_cap(s
sprintf(name, "acpi_video%d", count++);
device->backlight = backlight_device_register(name,
NULL, device, &acpi_backlight_ops);
- device->backlight->props.max_brightness = device->brightness->count-3;
kfree(name);
+ if (IS_ERR(device->backlight))
+ return;
+ device->backlight->props.max_brightness = device->brightness->count-3;
result = sysfs_create_link(&device->backlight->dev.kobj,
&device->dev->dev.kobj, "device");
--
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