linux-kernel - [82/93] ACPI: Add NULL pointer check in acpi_bus

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Date:	Fri, 19 Feb 2010 08:30:15 -0800
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,
	Thomas Renninger <trenn@...e.de>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Len Brown <len.brown@...el.com>
Subject: [82/93] ACPI: Add NULL pointer check in acpi_bus_start

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

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

From: Thomas Renninger <trenn@...e.de>

commit d2f6650a950dadd20667a04a9dc785f240d43695 upstream.

If acpi_bus_add does not return a device and it's passed
to acpi_bus_start, bad things will happen:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
IP: [<ffffffff8128402d>] acpi_bus_start+0x14/0x24
...
[<ffffffffa008977a>] acpiphp_bus_add+0xba/0x130 [acpiphp]
[<ffffffffa008aa72>] enable_device+0x132/0x2ff [acpiphp]
[<ffffffffa0089b68>] acpiphp_enable_slot+0xb8/0x130 [acpiphp]
[<ffffffffa0089df7>] handle_hotplug_event_func+0x87/0x190 [acpiphp]

Next patch would make this NULL pointer check obsolete, but
better having one more than one missing...

Signed-off-by: Thomas Renninger <trenn@...e.de>
Acked-by: Bjorn Helgaas <bjorn.helgaas@...com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/acpi/scan.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1357,6 +1357,9 @@ int acpi_bus_start(struct acpi_device *d
 {
 	struct acpi_bus_ops ops;

+	if (!device)
+		return -EINVAL;
+
 	memset(&ops, 0, sizeof(ops));
 	ops.acpi_op_start = 1;

--
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