linux-kernel - [PATCH 1/3] ieee1394: raw1394: Fix read() for 32bit userland on 64bit kernel

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Message-ID: <tkrat.0e3c053d4bae6087@s5r6.in-berlin.de>
Date:	Wed, 16 May 2007 01:00:35 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Petr Vandrovec <petr@...drovec.name>
cc:	dan@...nedy.org, linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] ieee1394: raw1394: Fix read() for 32bit userland on 64bit
 kernel

Date: Mon, 7 May 2007 04:14:47 +0200
From: Petr Vandrovec <petr@...drovec.name>

read() always failed with -EFAULT.  This was happening due to
raw1394_compat_read copying data to wrong location - access_ok always
failed as 'r' is kernel address, not user.  Whole function just tried to
copy data from 'r' to 'r', which is not good.

Signed-off-by: Petr Vandrovec <petr@...drovec.name>
Acked-by: Dan Dennedy <dan@...nedy.org>
Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de> (split into 3 patches)
---
 drivers/ieee1394/raw1394.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.22-rc1/drivers/ieee1394/raw1394.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/ieee1394/raw1394.c
+++ linux-2.6.22-rc1/drivers/ieee1394/raw1394.c
@@ -459,7 +459,7 @@ static const char __user *raw1394_compat
 static int
 raw1394_compat_read(const char __user *buf, struct raw1394_request *r)
 {
-	struct compat_raw1394_req __user *cr = (typeof(cr)) r;
+	struct compat_raw1394_req __user *cr = (typeof(cr)) buf;
 	if (!access_ok(VERIFY_WRITE, cr, sizeof(struct compat_raw1394_req)) ||
 	    P(type) ||
 	    P(error) ||

-- 
Stefan Richter
-=====-=-=== -=-= =----
http://arcgraph.de/sr/

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