| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 22/74] sony-laptop: fix SNC buffer calls when SN06 returns Integers | Date | Thu, 24 Jan 2013 01:26:34 -0200 |
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3.5.7.4 -stable review patch. If anyone has any objections, please let me know.
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From: Mattia Dongili <malattia@linux.it>
commit dcbeec264d73b7228ffdfe767eab69b2353099b1 upstream.
SN06 in some cases returns an Integer instead of a buffer. While the code handling the return value was trying to cope with the difference, the memcpy call was not making any difference between the two types of acpi_object union. This regression was introduced in 3.5. While there also rework the return value logic to improve readability.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48671 Cc: Fabrizio Narni <shibotto@gmail.com> Cc: <mus.svz@gmail.com> Signed-off-by: Mattia Dongili <malattia@linux.it> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/platform/x86/sony-laptop.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c index d456ff0..d4a6172 100644 --- a/drivers/platform/x86/sony-laptop.c +++ b/drivers/platform/x86/sony-laptop.c @@ -784,28 +784,29 @@ static int sony_nc_int_call(acpi_handle handle, char *name, int *value, static int sony_nc_buffer_call(acpi_handle handle, char *name, u64 *value, void *buffer, size_t buflen) { + int ret = 0; size_t len = len; union acpi_object *object = __call_snc_method(handle, name, value); if (!object) return -EINVAL; - if (object->type == ACPI_TYPE_BUFFER) + if (object->type == ACPI_TYPE_BUFFER) { len = MIN(buflen, object->buffer.length); + memcpy(buffer, object->buffer.pointer, len); - else if (object->type == ACPI_TYPE_INTEGER) + } else if (object->type == ACPI_TYPE_INTEGER) { len = MIN(buflen, sizeof(object->integer.value)); + memcpy(buffer, &object->integer.value, len); - else { + } else { pr_warn("Invalid acpi_object: expected 0x%x got 0x%x\n", ACPI_TYPE_BUFFER, object->type); - kfree(object); - return -EINVAL; + ret = -EINVAL; } - memcpy(buffer, object->buffer.pointer, len); kfree(object); - return 0; + return ret; } struct sony_nc_handles { -- 1.7.9.5
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