Commit 51b190b3 authored by Peter Chubb's avatar Peter Chubb Committed by Linus Torvalds

[PATCH] `unaligned access' in acpi get_root_bridge_busnr()

In drivers/acpi/glue.c the address of an integer is cast to the address of
an unsigned long.  This breaks on systems where a long is larger than an
int --- for a start the int can be misaligned; for a second the assignment
through the pointer will overwrite part of the next variable.
Signed-off-by: default avatarPeter Chubb <>
Acked-by: default avatar"Brown, Len" <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 11909d64
......@@ -96,7 +96,7 @@ struct acpi_find_pci_root {
static acpi_status
do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
int *busnr = (int *)data;
unsigned long *busnr = (unsigned long *)data;
struct acpi_resource_address64 address;
if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
......@@ -115,13 +115,13 @@ do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
static int get_root_bridge_busnr(acpi_handle handle)
acpi_status status;
int bus, bbn;
unsigned long bus, bbn;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
(unsigned long *)&bbn);
if (status == AE_NOT_FOUND) {
/* Assume bus = 0 */
......@@ -153,7 +153,7 @@ static int get_root_bridge_busnr(acpi_handle handle)
return bbn;
return (int)bbn;
static acpi_status
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment