linux-kernel - [106/117] V4L/DVB: budget: Oops: "BUG: unable to handle kernel NULL pointer dereference"

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Message-Id: <20100510223326.950383300@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:33:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Bjørn Mork <bjorn@...k.no>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [106/117] V4L/DVB: budget: Oops: "BUG: unable to handle kernel NULL pointer dereference"

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Bjørn Mork <bjorn@...k.no>

commit 6f550dc08369ee0bc6402963c377e65f0f2e3b71 upstream.

Never call dvb_frontend_detach if we failed to attach a frontend. This fixes
the following oops, which will be triggered by a missing stv090x module:

[    8.172997] DVB: registering new adapter (TT-Budget S2-1600 PCI)
[    8.209018] adapter has MAC addr = 00:d0:5c:cc:a7:29
[    8.328665] Intel ICH 0000:00:1f.5: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[    8.328753] Intel ICH 0000:00:1f.5: setting latency timer to 64
[    8.562047] DVB: Unable to find symbol stv090x_attach()
[    8.562117] BUG: unable to handle kernel NULL pointer dereference at 000000ac
[    8.562239] IP: [<e08b04a3>] dvb_frontend_detach+0x4/0x67 [dvb_core]

Ref http://bugs.debian.org/575207

Signed-off-by: Bjørn Mork <bjorn@...k.no>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/media/dvb/ttpci/budget.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/media/dvb/ttpci/budget.c
+++ b/drivers/media/dvb/ttpci/budget.c
@@ -643,9 +643,6 @@ static void frontend_init(struct budget
 					&budget->i2c_adap,
 					&tt1600_isl6423_config);
 
-			} else {
-				dvb_frontend_detach(budget->dvb_frontend);
-				budget->dvb_frontend = NULL;
 			}
 		}
 		break;


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