linux-kernel - [PATCH resend] i7core_edac: fix panic in udimm sysfs attributes registration

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Date:	Thu, 23 Sep 2010 19:24:22 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-edac@...r.kernel.org,
	Doug Thompson <norsk5@...oo.com>,
	Doug Thompson <dougthompson@...ssion.com>
Subject: [PATCH resend] i7core_edac: fix panic in udimm sysfs attributes
 registration

Array of udimm sysfs attributes was not ended with NULL marker, leading to
dereference of random memory.

EDAC DEBUG: edac_create_mci_instance_attributes: edac_create_mci_instance_attributes() file udimm0
EDAC DEBUG: edac_create_mci_instance_attributes: edac_create_mci_instance_attributes() file udimm1
EDAC DEBUG: edac_create_mci_instance_attributes: edac_create_mci_instance_attributes() file udimm2
BUG: unable to handle kernel NULL pointer dereference at 00000000000001a4
IP: [<ffffffff81330b36>] edac_create_mci_instance_attributes+0x148/0x1f1
PGD 0
Oops: 0000 [#1] PREEMPT SMP
last sysfs file:
CPU 3
Modules linked in:

Pid: 1, comm: swapper Not tainted 2.6.36-rc3-nv+ #483 P6T SE/System Product Name
RIP: 0010:[<ffffffff81330b36>]  [<ffffffff81330b36>] edac_create_mci_instance_attributes+0x148/0x1f1
(...)
Call Trace:
 [<ffffffff81330b86>] edac_create_mci_instance_attributes+0x198/0x1f1
 [<ffffffff81330c9a>] edac_create_sysfs_mci_device+0xbb/0x2b2
 [<ffffffff8132f533>] edac_mc_add_mc+0x46b/0x557
 [<ffffffff81428901>] i7core_probe+0xccf/0xec0
 [<ffffffff81230193>] local_pci_probe+0x12/0x16
 [<ffffffff8123097b>] pci_device_probe+0x60/0x8f
 [<ffffffff812b65c9>] ? driver_sysfs_add+0x6b/0x90
 [<ffffffff812b6711>] driver_probe_device+0xa7/0x136
 [<ffffffff812b67f8>] __driver_attach+0x58/0x7c
 [<ffffffff812b67a0>] ? __driver_attach+0x0/0x7c
 [<ffffffff812b5ed4>] bus_for_each_dev+0x4e/0x83
 [<ffffffff812b655c>] driver_attach+0x19/0x1b
 [<ffffffff812b5834>] bus_add_driver+0x12b/0x277
 [<ffffffff812b6ac1>] driver_register+0x99/0x10a
 [<ffffffff81230be8>] __pci_register_driver+0x63/0xd3
 [<ffffffff818bd6fa>] i7core_init+0x9a/0xbb
 [<ffffffff818bd660>] ? i7core_init+0x0/0xbb
 [<ffffffff81000210>] do_one_initcall+0x7a/0x12e
 [<ffffffff81897689>] kernel_init+0x143/0x1cc
 [<ffffffff8102edd4>] kernel_thread_helper+0x4/0x10
 [<ffffffff814357ad>] ? restore_args+0x0/0x30
 [<ffffffff81897546>] ? kernel_init+0x0/0x1cc
 [<ffffffff8102edd0>] ? kernel_thread_helper+0x0/0x10
Code: 24 49 89 44 24 08 4c 89 20 48 8b 43 10 4d 89 74 24 58 49 89 44 24 50 83 3d d7 13 53 00 00 78 22 48 8b 43 10 48 c7 c2 90 7e 66 81 <48> 8b 08 4d 89 f0 48 89 d6 48 c7 c7 7e a9 79 81 31 c0 e8 21 10
RIP  [<ffffffff81330b36>] edac_create_mci_instance_attributes+0x148/0x1f1
 RSP <ffff8801bfca7a30>
CR2: 00000000000001a4
---[ end trace 20de320855b81d78 ]---
Kernel panic - not syncing: Attempted to kill init!

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Cc: stable@...nel.org
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
Acked-by: Doug Thompson <dougthompson@...ssion.com>
---
 drivers/edac/i7core_edac.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index e0187d1..0fd5b85 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1140,6 +1140,7 @@ static struct mcidev_sysfs_attribute i7core_udimm_counters_attrs[] = {
 	ATTR_COUNTER(0),
 	ATTR_COUNTER(1),
 	ATTR_COUNTER(2),
+	{ .attr = { .name = NULL } }
 };
 
 static struct mcidev_sysfs_group i7core_udimm_counters = {
-- 
1.7.2.3

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