linux-kernel - Re: via sata oops on init

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Date:	Sat, 29 Jul 2006 16:45:28 +0200
From:	Johannes Weiner <hnazfoo@...glemail.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: via sata oops on init

Hi,

On Fri, Jul 28, 2006 at 07:39:50PM -0400, Dave Jones wrote:
> 2.6.18-rc2-git6
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000000
> EIP is at make_class_name+0x27
> eax: 00000000 ebx: ffffffff ecx: ffffffff edx: 00000009
> esi: f8d16cc2 edi: 00000000 ebp: f7fa9d3c esp: f7fa9d2c
> 
> Call Trace:
> class_device_del+0xac
> class_device_unregister
> scsi_remove_host
> ata_host_remove
> ata_device_add

I think the problem lays in scsi/libata-core.c:5423 in
torvalds/linux-2.6 v2.6.18-rc2-g6482132, stating:

[...]
struct ata_host_set *host_set = kzalloc(...);
[...]

Initialization of some structure members, but not ports(!)

for (...) {
	struct ata_port *ap;

	ap = ata_host_add(ent, host_set, i);
	if (!ap)
		goto err_out;
	
	host_set->ports[i] = ap;

err_out:
	for (i = 0; i < count; i++) {
		ata_host_remove(host_set->ports[i], 1);
[...]

ata_device_add fails, calls ata_host_remove with pointers to unitialized
memory.

Hannes
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