From 96d07940623a2a40b2eec01daebf93bbaaee8a3b Mon Sep 17 00:00:00 2001 From: Lv Zheng Date: Mon, 10 Jul 2017 15:23:21 +0800 Subject: ACPICA: Tables: Add sanity check in acpi_put_table() ACPICA commit 73512384c9eb1e7f1b28d0a7372df26a3732f96b To avoid caller to trigger unexpected warning messages (Link #1): ACPI Warning: Table ffffffffbb461d20, Validation count is zero before decrement Which is reported from acpi_tb_put_table(). When the table is validated, the pointer must be non-zero. Thus the message is not suitable for invalidated tables. This patch fixes the callee side based on this fact. Reported by Cristian Aravena Romero, Fixed by Lv Zheng. Link: https://github.com/acpica/acpica/commit/73512384 Link: https://bugzilla.kernel.org/show_bug.cgi?id=191221 [#1] Reported-by: Cristian Aravena Romero Signed-off-by: Lv Zheng Signed-off-by: Bob Moore Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/tbxface.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/acpi/acpica/tbxface.c') diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c index 010b1c43df92..18508b2c0c05 100644 --- a/drivers/acpi/acpica/tbxface.c +++ b/drivers/acpi/acpica/tbxface.c @@ -369,6 +369,10 @@ void acpi_put_table(struct acpi_table_header *table) ACPI_FUNCTION_TRACE(acpi_put_table); + if (!table) { + return_VOID; + } + (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); /* Walk the root table list */ -- cgit v1.2.3