If the call to acpi_ds_init_aml_walk() fails, then we have to undo the
walk state push done by acpi_ds_create_walk_state(). Otherwise, the new
walk state (which has just been freed) will remain on the thread's
walk_state_list and be dereferenced in acpi_ps_parse_aml() when we try
to get the new state.
You can observe this when reading e.g.
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0F:01/status
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
---
drivers/acpi/acpica/dsmethod.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c
index 47c7b52..44b50a6 100644
--- a/drivers/acpi/acpica/dsmethod.c
+++ b/drivers/acpi/acpica/dsmethod.c
@@ -596,6 +596,8 @@ cleanup:
/* On error, we must terminate the method properly */
acpi_ds_terminate_control_method(obj_desc, next_walk_state);
+ if (thread)
+ acpi_ds_pop_walk_state(thread);
acpi_ds_delete_walk_state(next_walk_state);
return_ACPI_STATUS(status);
--
1.9.1
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