linux-kernel - [PATCH] drivers/platform/x86/amilo-rfkill.c::amilo_rfkill

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Message-ID: <alpine.LNX.2.00.1203230107100.2935@swampdragon.chaosbits.net>
Date:	Fri, 23 Mar 2012 01:08:34 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	platform-driver-x86@...r.kernel.org,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH] drivers/platform/x86/amilo-rfkill.c::amilo_rfkill_probe()
 avoid NULL deref

In drivers/platform/x86/amilo-rfkill.c::amilo_rfkill_probe() the call
to dmi_first_match() may fail and return NULL. If it does return NULL,
then we'll be dereferencing a NULL pointer in the rfkill_alloc() call
where we do 'system_id->driver_data' --> KABOOM!

Avoid that problem by testing for a NULL return value from
dmi_first_match() and bailing out if it fails.

I was a bit uncertain about what to return in the failure case. In the
end I settled for -ENXIO as the most logical error to return.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/platform/x86/amilo-rfkill.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

 Compile tested only since I have no real way to test this.

diff --git a/drivers/platform/x86/amilo-rfkill.c b/drivers/platform/x86/amilo-rfkill.c
index 19170bb..a514bf6 100644
--- a/drivers/platform/x86/amilo-rfkill.c
+++ b/drivers/platform/x86/amilo-rfkill.c
@@ -97,9 +97,12 @@ static struct rfkill *amilo_rfkill_dev;
 
 static int __devinit amilo_rfkill_probe(struct platform_device *device)
 {
+	int rc;
 	const struct dmi_system_id *system_id =
 		dmi_first_match(amilo_rfkill_id_table);
-	int rc;
+
+	if (!system_id)
+		return -ENXIO;
 
 	amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
 					RFKILL_TYPE_WLAN,
-- 
1.7.9.4


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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