* [PATCH 1/1] acpi: check return value of acpi_os_map_memory
@ 2013-10-28 6:04 RUC_SoftSec
2013-10-28 11:01 ` Rafael J. Wysocki
0 siblings, 1 reply; 2+ messages in thread
From: RUC_SoftSec @ 2013-10-28 6:04 UTC (permalink / raw)
To: Len Brown, Rafael J. Wysocki; +Cc: linux-acpi, linux-kernel, RUC_SoftSec
Function acpi_os_map_memory() may return a NULL pointer, it should be validated non-NULL before used.
This bug is found by a static tool developed by RUC_SoftSec, supported by China.X.Orion.
Signed-off-by: RUC_SoftSec <rucsoftsec@gmail.com>
---
drivers/acpi/osl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index e5f416c..bf8f93f 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -717,6 +717,8 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
ACPI_HEADER_SIZE);
+ if (table == NULL)
+ return AE_OK;
if (table_offset + table->length > all_tables_size) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 1/1] acpi: check return value of acpi_os_map_memory
2013-10-28 6:04 [PATCH 1/1] acpi: check return value of acpi_os_map_memory RUC_SoftSec
@ 2013-10-28 11:01 ` Rafael J. Wysocki
0 siblings, 0 replies; 2+ messages in thread
From: Rafael J. Wysocki @ 2013-10-28 11:01 UTC (permalink / raw)
To: RUC_SoftSec; +Cc: Len Brown, linux-acpi, linux-kernel
On Monday, October 28, 2013 02:04:19 PM RUC_SoftSec wrote:
> Function acpi_os_map_memory() may return a NULL pointer, it should be validated non-NULL before used.
> This bug is found by a static tool developed by RUC_SoftSec, supported by China.X.Orion.
>
> Signed-off-by: RUC_SoftSec <rucsoftsec@gmail.com>
> ---
> drivers/acpi/osl.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index e5f416c..bf8f93f 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -717,6 +717,8 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
>
> table = acpi_os_map_memory(acpi_tables_addr + table_offset,
> ACPI_HEADER_SIZE);
> + if (table == NULL)
"if (!table)" perhaps?
> + return AE_OK;
And why is it a good idea to return success then?
>
> if (table_offset + table->length > all_tables_size) {
> acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
>
Thanks!
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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2013-10-28 11:01 ` Rafael J. Wysocki
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