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ACPI: pfr_telemetry: Fix info leak in pfrt_log_ioctl()

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The "data_info" struct is copied to the user.  It has a 4 byte struct
hole after the last struct member so we need to memset that to avoid
copying uninitialized stack data to the user.

Fixes: b0013e037a ("ACPI: Introduce Platform Firmware Runtime Telemetry driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dan Carpenter 2022-01-07 10:34:07 +03:00 committed by Rafael J. Wysocki
parent 31834aaa4e
commit 7bf2e4d5ca
1 changed files with 1 additions and 0 deletions
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drivers/acpi/pfr_telemetry.c
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@ -83,6 +83,7 @@ static int get_pfrt_log_data_info(struct pfrt_log_data_info *data_info,
union acpi_object *out_obj, in_obj, in_buf;
int ret = -EBUSY;
memset(data_info, 0, sizeof(*data_info));
memset(&in_obj, 0, sizeof(in_obj));
memset(&in_buf, 0, sizeof(in_buf));
in_obj.type = ACPI_TYPE_PACKAGE;