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greybus: manifest: reserve control connection cport/bundle ids 

5ae6906e ('interface: Get manifest using Control protocol') in
gb_create_control_connection introduces the concept that the Control
Protocol is at cport_id 2 and bundle_id 0. Currently the manifest parsing
code does not enforce that concept and as a result it is possible for a
manifest to declare the Control Protocol at a different address.

Based on that change 6a6945c9684e ('greybus-spec/control: Formally define
Control Protocol reserved addresses') makes the above coding convention a
formal requirement of the greybus specification. This patch implements the
change introduced in the specification @ 6a6945c9684e.

This patch will reject a manifest if it doesn't match the critiera laid
down in the spec.

This patch makes three changes:
- Changes gb_manifest_parse_cports so that only GB_CONTROL_CPORT_ID may
  have a protocol_id of GREYBUS_PROTOCOL_CONTROL, otherwise the manifest
  will be rejected.
- Changes gb_manifest_parse_bundles so that only GB_CONTROL_BUNDLE_ID may
  have a class of GREYBUS_CLASS_CONTROL, otherwise the manifest will be
  rejected.
- gb_connection_exit() and gb_connection_destroy() are removed from
  gb_manifest_parse_cports on error - since gb_manifest_parse_bundles()
  already has a call into gb_bundle_destroy() which will again call
  gb_connection_exit() and gb_connection_destroy() leading to an oops.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-07-21 09:10:27 +01:00 committed by Greg Kroah-Hartman
parent 18d777cd66
commit b38fe3472d
1 changed files with 32 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/staging/greybus/manifest.c
View File

@ -201,18 +201,16 @@ static char *gb_string_get(struct gb_interface *intf, u8 string_id)
static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
{
struct gb_interface *intf = bundle->intf;
struct gb_connection *connection;
struct gb_connection *connection_next;
struct manifest_desc *desc;
struct manifest_desc *next;
u8 bundle_id = bundle->id;
u8 protocol_id;
u16 cport_id;
u32 count = 0;
/* Set up all cport descriptors associated with this bundle */
list_for_each_entry_safe(desc, next, &intf->manifest_descs, links) {
struct greybus_descriptor_cport *desc_cport;
u8 protocol_id;
u16 cport_id;
if (desc->type != GREYBUS_TYPE_CPORT)
continue;
@ -223,25 +221,26 @@ static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
cport_id = le16_to_cpu(desc_cport->id);
if (cport_id > CPORT_ID_MAX)
goto cleanup;
goto exit;
/* Found one. Set up its function structure */
protocol_id = desc_cport->protocol_id;
/* Don't recreate connection for control cport */
/* Validate declarations of the control protocol CPort */
if (cport_id == GB_CONTROL_CPORT_ID) {
/* This should have protocol set to control protocol*/
WARN_ON(protocol_id != GREYBUS_PROTOCOL_CONTROL);
if (protocol_id != GREYBUS_PROTOCOL_CONTROL)
goto print_error_exit;
/* Don't recreate connection for control cport */
goto release_descriptor;
}
/* Nothing else should have its protocol as control protocol */
if (WARN_ON(protocol_id == GREYBUS_PROTOCOL_CONTROL))
goto release_descriptor;
if (protocol_id == GREYBUS_PROTOCOL_CONTROL) {
goto print_error_exit;
}
if (!gb_connection_create(bundle, cport_id, protocol_id))
goto cleanup;
goto exit;
release_descriptor:
count++;
@ -251,14 +250,14 @@ release_descriptor:
}
return count;
cleanup:
/* An error occurred; undo any changes we've made */
list_for_each_entry_safe(connection, connection_next,
&bundle->connections, bundle_links) {
gb_connection_exit(connection);
gb_connection_destroy(connection);
count--;
}
print_error_exit:
/* A control protocol parse error was encountered */
dev_err(&bundle->dev,
"cport_id, protocol_id 0x%04hx,0x%04hx want 0x%04hx,0x%04hx\n",
cport_id, protocol_id, GB_CONTROL_CPORT_ID,
GREYBUS_PROTOCOL_CONTROL);
exit:
return 0; /* Error; count should also be 0 */
}
@ -287,15 +286,24 @@ static u32 gb_manifest_parse_bundles(struct gb_interface *intf)
/* Don't recreate bundle for control cport */
if (desc_bundle->id == GB_CONTROL_BUNDLE_ID) {
/* This should have class set to control class */
WARN_ON(desc_bundle->class != GREYBUS_CLASS_CONTROL);
if (desc_bundle->class != GREYBUS_CLASS_CONTROL) {
dev_err(&intf->dev,
"bad class 0x%02x for control bundle\n",
desc_bundle->class);
goto cleanup;
}
bundle = intf->control->connection->bundle;
goto parse_cports;
}
/* Nothing else should have its class set to control class */
if (WARN_ON(desc_bundle->class == GREYBUS_CLASS_CONTROL))
goto release_descriptor;
if (desc_bundle->class == GREYBUS_CLASS_CONTROL) {
dev_err(&intf->dev,
"bundle 0x%02x cannot use control class\n",
desc_bundle->id);
goto cleanup;
}
bundle = gb_bundle_create(intf, desc_bundle->id,
desc_bundle->class);
@ -307,11 +315,9 @@ parse_cports:
if (!gb_manifest_parse_cports(bundle))
goto cleanup;
release_descriptor:
count++;
/* Done with this bundle descriptor */
release_manifest_descriptor(desc);
count++;
}
return count;