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

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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: Peter Chubb <peterc@gelato.unsw.edu.au>
Acked-by: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Chubb 2005-10-19 22:45:14 -07:00 committed by Linus Torvalds
parent 11909d6438
commit 51b190b304
1 changed files with 4 additions and 4 deletions
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8
drivers/acpi/glue.c
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@ -96,7 +96,7 @@ struct acpi_find_pci_root {
static acpi_status static acpi_status
do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 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; struct acpi_resource_address64 address;
if (resource->id != ACPI_RSTYPE_ADDRESS16 && 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) static int get_root_bridge_busnr(acpi_handle handle)
{ {
acpi_status status; acpi_status status;
int bus, bbn; unsigned long bus, bbn;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL, status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
(unsigned long *)&bbn); &bbn);
if (status == AE_NOT_FOUND) { if (status == AE_NOT_FOUND) {
/* Assume bus = 0 */ /* Assume bus = 0 */
printk(KERN_INFO PREFIX printk(KERN_INFO PREFIX
@ -153,7 +153,7 @@ static int get_root_bridge_busnr(acpi_handle handle)
} }
exit: exit:
acpi_os_free(buffer.pointer); acpi_os_free(buffer.pointer);
return bbn; return (int)bbn;
} }
static acpi_status static acpi_status