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ACPI: property: Allow _DSD buffer data only for byte accessors
[ Upstream commit046ece773c
] In accordance with ACPI specificication and _DSD data buffer representation the data there is an array of bytes. Hence, accessing it with something longer will create a sparse data which is against of how device property APIs work in general and also not defined in the ACPI specification (see [1]). Fix the code to emit an error if non-byte accessor is used to retrieve _DSD buffer data. Fixes:369af6bf2c
("ACPI: property: Read buffer properties as integers") Link: https://uefi.org/specs/ACPI/6.5/19_ASL_Reference.html#buffer-declare-buffer-object # [1] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> [ rjw: Add missing braces ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 10 additions and 9 deletions
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@ -1114,25 +1114,26 @@ static int acpi_data_prop_read(const struct acpi_device_data *data,
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switch (proptype) {
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case DEV_PROP_STRING:
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break;
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case DEV_PROP_U8 ... DEV_PROP_U64:
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default:
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if (obj->type == ACPI_TYPE_BUFFER) {
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if (nval > obj->buffer.length)
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return -EOVERFLOW;
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break;
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} else {
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if (nval > obj->package.count)
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return -EOVERFLOW;
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}
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fallthrough;
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default:
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if (nval > obj->package.count)
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return -EOVERFLOW;
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break;
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}
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if (nval == 0)
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return -EINVAL;
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if (obj->type != ACPI_TYPE_BUFFER)
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items = obj->package.elements;
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else
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if (obj->type == ACPI_TYPE_BUFFER) {
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if (proptype != DEV_PROP_U8)
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return -EPROTO;
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items = obj;
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} else {
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items = obj->package.elements;
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}
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switch (proptype) {
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case DEV_PROP_U8:
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