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authorAaron Lu <aaron.lu@intel.com>2012-10-09 11:37:48 +0400
committerJeff Garzik <jgarzik@redhat.com>2012-11-16 08:20:55 +0400
commit60817a680b1bd3341b6909fab7d8a1fcc3a78369 (patch)
tree7c052113c5c12511f225aca01a0d09d947d62057 /drivers/ata
parentc5e35d6c512c43105883043dd62cf7257ec3f9f0 (diff)
downloadlinux-60817a680b1bd3341b6909fab7d8a1fcc3a78369.tar.xz
libata-acpi: Fix NULL ptr derference in ata_acpi_dev_handle
commit 6b66d95895c149cbc04d4fac5a2f5477c543a8ae didn't handle SATA PMP case in ata_acpi_bind_device and will cause a NULL ptr dereference when user attached a SATA drive to the PMP port. Fix this by checking PMP support. This bug is reported by Dan van der Ster in the following bugzilla page: https://bugzilla.kernel.org/show_bug.cgi?id=48211 Reported-by: Dan van der Ster <dan@vanderster.com> Tested-by: Dan van der Ster <dan@vanderster.com> Signed-off-by: Aaron Lu <aaron.lu@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Tested-by: Simon <tangouniform@sbcglobal.net>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-acpi.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index fd9ecf74e631..5b0ba3f20edc 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -1105,10 +1105,15 @@ static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev,
struct acpi_device *acpi_dev;
struct acpi_device_power_state *states;
- if (ap->flags & ATA_FLAG_ACPI_SATA)
- ata_dev = &ap->link.device[sdev->channel];
- else
+ if (ap->flags & ATA_FLAG_ACPI_SATA) {
+ if (!sata_pmp_attached(ap))
+ ata_dev = &ap->link.device[sdev->id];
+ else
+ ata_dev = &ap->pmp_link[sdev->channel].device[sdev->id];
+ }
+ else {
ata_dev = &ap->link.device[sdev->id];
+ }
*handle = ata_dev_acpi_handle(ata_dev);