linux-kernel - [PATCH] vgaarb: fix typo deference when copying from userspace

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Date:	Tue, 12 Jan 2010 19:58:31 +0200
From:	Tiago Vignatti <tiago.vignatti@...ia.com>
To:	Dave Airlie <airlied@...hat.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Paulo R. Zanoni" <przanoni@...il.com>,
	Henry Zhao <Henry.Zhao@....COM>,
	Andy Getzendanner <james.getzendanner@...dents.olin.edu>,
	Brad Spengler <spender@...ecurity.net>,
	"dri-devel@...ts.sf.net" <dri-devel@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tiago Vignatti <tiago.vignatti@...ia.com>
Subject: [PATCH] vgaarb: fix typo deference when copying from userspace

From: Brad Spengler <spender@...ecurity.net>

libpciaccess is not triggering such code though.

Signed-off-by: Tiago Vignatti <tiago.vignatti@...ia.com>
---
Andy Getzendanner tried to fix this, but he seems did a wrong approach:
http://marc.info/?l=linux-kernel&m=126112173704466

Andy: please test (and put your tag review!) this one instead. Thanks.

 drivers/gpu/vga/vgaarb.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 1ac0c93..2f6cf69 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -961,7 +961,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
 		remaining -= 7;
 		pr_devel("client 0x%p called 'target'\n", priv);
 		/* if target is default */
-		if (!strncmp(buf, "default", 7))
+		if (!strncmp(curr_pos, "default", 7))
 			pdev = pci_dev_get(vga_default_device());
 		else {
 			if (!vga_pci_str_to_vars(curr_pos, remaining,
-- 
1.6.0.4

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