[lkml]   [2010]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[151/197] agp/hp: fixup hp agp after ACPI changes
2.6.32-stable review patch.  If anyone has any objections, please let us know.


From: Bjorn Helgaas <>

commit 67fe63b0715ccfaefa0af8a6e705c5470ee5cada upstream.

Commit 15b8dd53f5ffa changed the string in info->hardware_id from a static
array to a pointer and added a length field. But instead of changing
"sizeof(array)" to "length", we changed it to "sizeof(length)" (== 4),
which corrupts the string we're trying to null-terminate.

We no longer even need to null-terminate the string, but we *do* need to
check whether we found a HID. If there's no HID, we used to have an empty
array, but now we have a null pointer.

The combination of these defects causes this oops:

Unable to handle kernel NULL pointer dereference (address 0000000000000003)
modprobe[895]: Oops 8804682956800 [1]
ip is at zx1_gart_probe+0xd0/0xcc0 [hp_agp]

Signed-off-by: Bjorn Helgaas <>
Reported-by: Émeric Maschino <>
Signed-off-by: Dave Airlie <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/char/agp/hp-agp.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/char/agp/hp-agp.c
+++ b/drivers/char/agp/hp-agp.c
@@ -488,9 +488,8 @@ zx1_gart_probe (acpi_handle obj, u32 dep
handle = obj;
do {
status = acpi_get_object_info(handle, &info);
- if (ACPI_SUCCESS(status)) {
+ if (ACPI_SUCCESS(status) && (info->valid & ACPI_VALID_HID)) {
/* TBD check _CID also */
- info->hardware_id.string[sizeof(info->hardware_id.length)-1] = '\0';
match = (strcmp(info->hardware_id.string, "HWP0001") == 0);
if (match) {

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2010-04-22 21:47    [W:0.687 / U:0.636 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site