[PATCH 5.4 155/215] staging: mmal-vchiq: Fix client_component for 64 bit kernel

Greg Kroah-Hartman
2024-04-11T10:23:30Z

From: Dave Stevenson <dave.stevenson@raspberrypi.org>

[ Upstream commit 22e64b486adc4785542f8002c3af4c895490f841 ]

The MMAL client_component field is used with the event
mechanism to allow the client to identify the component for
which the event is generated.
The field is only 32bits in size, therefore we can't use a
pointer to the component in a 64 bit kernel.

Component handles are already held in an array per VCHI
instance, so use the array index as the client_component handle
to avoid having to create a new IDR for this purpose.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20200629150945.10720-5-nsaenzjulienne@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: f37e76abd614 ("staging: vc04_services: fix information leak in create_component()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c | 8 +++++++-
drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h | 1 +
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
index 9b47ba4d2d3cd..23d869ba12e69 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
@@ -928,7 +928,7 @@ static int create_component(struct vchiq_mmal_instance *instance,

/* build component create message */
m.h.type = MMAL_MSG_TYPE_COMPONENT_CREATE;
- m.u.component_create.client_component = (u32)(unsigned long)component;
+ m.u.component_create.client_component = component->client_component;
strncpy(m.u.component_create.name, name,
sizeof(m.u.component_create.name));

@@ -1635,6 +1635,12 @@ int vchiq_mmal_component_init(struct vchiq_mmal_instance *instance,
goto unlock;
}

+ /* We need a handle to reference back to our component structure.
+ * Use the array index in instance->component rather than rolling
+ * another IDR.
+ */
+ component->client_component = idx;
+
ret = create_component(instance, component, name);
if (ret < 0) {
pr_err("%s: failed to create component %d (Not enough GPU mem?)\n",
diff --git a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
index 4e34728d87e53..a75c5f0a770ef 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
@@ -92,6 +92,7 @@ struct vchiq_mmal_component {
struct vchiq_mmal_port input[MAX_PORT_COUNT]; /* input ports */
struct vchiq_mmal_port output[MAX_PORT_COUNT]; /* output ports */
struct vchiq_mmal_port clock[MAX_PORT_COUNT]; /* clock ports */
+ u32 client_component; /* Used to ref back to client struct */
};

int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance);
--
2.43.0