Commit 344d6d02 authored by James Bottomley's avatar James Bottomley Committed by Ben Hutchings

ses: fix additional element traversal bug

commit 5e103356 upstream.

KASAN found that our additional element processing scripts drop off
the end of the VPD page into unallocated space.  The reason is that
not every element has additional information but our traversal
routines think they do, leading to them expecting far more additional
information than is present.  Fix this by adding a gate to the
traversal routine so that it only processes elements that are expected
to have additional information (list is in SES-2 section 6.1.13.1:
Additional Element Status diagnostic page overview)
Reported-by: default avatarPavel Tikhomirov <ptikhomirov@virtuozzo.com>
Tested-by: default avatarPavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 25ef9385
......@@ -454,7 +454,15 @@ static void ses_enclosure_data_process(struct enclosure_device *edev,
if (desc_ptr)
desc_ptr += len;
if (addl_desc_ptr)
if (addl_desc_ptr &&
/* only find additional descriptions for specific devices */
(type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
/* these elements are optional */
type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
addl_desc_ptr += addl_desc_ptr[1] + 2;
}
......
......@@ -29,7 +29,11 @@
/* A few generic types ... taken from ses-2 */
enum enclosure_component_type {
ENCLOSURE_COMPONENT_DEVICE = 0x01,
ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS = 0x07,
ENCLOSURE_COMPONENT_SCSI_TARGET_PORT = 0x14,
ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT = 0x15,
ENCLOSURE_COMPONENT_ARRAY_DEVICE = 0x17,
ENCLOSURE_COMPONENT_SAS_EXPANDER = 0x18,
};
/* ses-2 common element status */
......
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