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| author | Thomas Renninger <trenn@suse.de> | 2010-01-29 17:48:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-02-23 07:37:57 -0800 |
| commit | c51bfb22f31d384833e82a66872cccbab7c593df (patch) | |
| tree | e3858857ce3d14e5e9118868664de20b6b2fad4e | |
| parent | ea658ff1d6314ed206393dd23d2cd45b22f8f6b4 (diff) | |
| download | linux-ak78xx-c51bfb22f31d384833e82a66872cccbab7c593df.tar.gz | |
ACPI: Add NULL pointer check in acpi_bus_start
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@suse.de>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | 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 14a7481c97d..0b09703f06f 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; |