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Message-ID: <Pine.LNX.4.64.0907281756010.28189@ask.diku.dk>
Date: Tue, 28 Jul 2009 17:56:35 +0200 (CEST)
From: Julia Lawall <julia@...u.dk>
To: rui.zhang@...el.com, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 9/9] drivers/acpi: correct error-handling code
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/)
// <smpl>
@@
identifier fld,fld1;
expression x,E;
@@
x = backlight_device_register(...)
... when != x = E
when != &x
when != x->fld1
(
((IS_ERR(x))||...)
|
* x->fld
)
// </smpl>
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;
device->backlight->props.max_brightness = device->brightness->count-3;
kfree(name);
--
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