From: Stefan Wahren stefan.wahren@i2se.com
[ Upstream commit ca225857faf237234d2fffe5d1919467dfadd822 ]
In case of an invalid handle the function find_servive_by_handle returns NULL. So take care of this and avoid a NULL pointer dereference.
Reviewed-by: Nicolas Saenz Julienne nsaenz@kernel.org Signed-off-by: Stefan Wahren stefan.wahren@i2se.com Link: https://lore.kernel.org/r/1642968143-19281-18-git-send-email-stefan.wahren@i... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../staging/vc04_services/interface/vchiq_arm/vchiq_core.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c index 38b10fd5d992..95b91fe45cb3 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c @@ -2280,6 +2280,9 @@ void vchiq_msg_queue_push(unsigned int handle, struct vchiq_header *header) struct vchiq_service *service = find_service_by_handle(handle); int pos;
+ if (!service) + return; + while (service->msg_queue_write == service->msg_queue_read + VCHIQ_MAX_SLOTS) { if (wait_for_completion_interruptible(&service->msg_queue_pop)) @@ -2299,6 +2302,9 @@ struct vchiq_header *vchiq_msg_hold(unsigned int handle) struct vchiq_header *header; int pos;
+ if (!service) + return NULL; + if (service->msg_queue_write == service->msg_queue_read) return NULL;