From 3c87f372695592bf86e9dab7b1ec7d439fda577b Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Mon, 3 Apr 2017 13:52:14 -0700
Subject: [PATCH] acpi, nfit: fix acpi_get_table leak
Calls to acpi_get_table() must be paired with acpi_put_table() to undo
the mapping established by acpi_tb_acquire_table().
It turns out this has no effect in practice since the NFIT will already
be mapped to support the /sys/firmware/acpi/tables/NFIT attribute in
sysfs.
Fixes: 6b11d1d67713 ("ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users")
Cc: Lv Zheng <lv.zheng@intel.com>
Reported-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit/core.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index c3decdca46f9..53943d6f4214 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2831,6 +2831,11 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
}
EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
+static void acpi_nfit_put_table(void *table)
+{
+ acpi_put_table(table);
+}
+
static int acpi_nfit_add(struct acpi_device *adev)
{
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -2847,6 +2852,10 @@ static int acpi_nfit_add(struct acpi_device *adev)
dev_dbg(dev, "failed to find NFIT at startup\n");
return 0;
}
+
+ rc = devm_add_action_or_reset(dev, acpi_nfit_put_table, tbl);
+ if (rc)
+ return rc;
sz = tbl->length;
acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
--
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