Permalink
Browse files

ACPI / PNP: Do not crash due to stale pointer use during system resume

During resume from system suspend the 'data' field of
struct pnp_dev in pnpacpi_set_resources() may be a stale pointer,
due to removal of the associated ACPI device node object in the
previous suspend-resume cycle.  This happens, for example, if a
dockable machine is booted in the docking station and then suspended
and resumed and suspended again.  If that happens,
pnpacpi_build_resource_template() called from pnpacpi_set_resources()
attempts to use that pointer and crashes.

However, pnpacpi_set_resources() actually checks the device's ACPI
handle, attempts to find the ACPI device node object attached to it
and returns an error code if that fails, so in fact it knows what the
correct value of dev->data should be.  Use this observation to update
dev->data with the correct value if necessary and dump a call trace
if that's the case (once).

We still need to fix the root cause of this issue, but preventing
systems from crashing because of it is an improvement too.

Reported-and-tested-by: Zdenek Kabelac <zdenek.kabelac@gmail.com>
References: https://bugzilla.kernel.org/show_bug.cgi?id=51071
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  • Loading branch information...
1 parent ac5de53 commit 075dc5a1c7dabaa6c1da1bbec2948d335c45b378 Rafael J. Wysocki committed with damentz Nov 29, 2012
Showing with 3 additions and 0 deletions.
  1. +3 −0 drivers/pnp/pnpacpi/core.c
@@ -95,6 +95,9 @@ static int pnpacpi_set_resources(struct pnp_dev *dev)
return -ENODEV;
}
+ if (WARN_ON_ONCE(acpi_dev != dev->data))
+ dev->data = acpi_dev;
+
ret = pnpacpi_build_resource_template(dev, &buffer);
if (ret)
return ret;

0 comments on commit 075dc5a

Please sign in to comment.