From 3c87f372695592bf86e9dab7b1ec7d439fda577b Mon Sep 17 00:00:00 2001 From: Dan Williams 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 Reported-by: Ross Zwisler Signed-off-by: Dan Williams --- 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);