From 4ca846e9270f305ad19e61f6654664f31459f332 Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Sat, 27 Sep 2008 13:27:51 +0800 Subject: [PATCH] ACPICA: Add support for zero-length buffer-to-string conversions Allow zero length strings during interpreter buffer-to-string conversions. For example, during the ToDecimalString and ToHexString operaters, as well as implicit conversions. Fiodor Suietov. ACPICA BZ 585. http://www.acpica.org/bugzilla/show_bug.cgi?id=585 Signed-off-by: Bob Moore Signed-off-by: Lin Ming Signed-off-by: Len Brown --- drivers/acpi/executer/exconvrt.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/executer/exconvrt.c b/drivers/acpi/executer/exconvrt.c index 890378e789a4..1d1f35adddde 100644 --- a/drivers/acpi/executer/exconvrt.c +++ b/drivers/acpi/executer/exconvrt.c @@ -512,9 +512,14 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, /* * Create a new string object and string buffer * (-1 because of extra separator included in string_length from above) + * Allow creation of zero-length strings from zero-length buffers. */ + if (string_length) { + string_length--; + } + return_desc = acpi_ut_create_string_object((acpi_size) - (string_length - 1)); + string_length); if (!return_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } @@ -537,7 +542,9 @@ acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, * Null terminate the string * (overwrites final comma/space from above) */ - new_buf--; + if (obj_desc->buffer.length) { + new_buf--; + } *new_buf = 0; break; -- 2.20.1