From: Thomas Renninger <trenn@xxxxxxx>
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@xxxxxxx>
Acked-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
CC: stable@xxxxxxxxxx
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
drivers/acpi/scan.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ff9f622..8044583 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1357,6 +1357,9 @@ int acpi_bus_start(struct acpi_device *device)
{
struct acpi_bus_ops ops;
+ if (!device)
+ return -EINVAL;
+
memset(&ops, 0, sizeof(ops));
ops.acpi_op_start = 1;
--
1.6.0.6
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