From ec394af5ea1d8ee62681815d167115ac618bcb42 Mon Sep 17 00:00:00 2001 From: Petr Machata Date: Thu, 22 Nov 2018 23:28:07 +0000 Subject: switchdev: SWITCHDEV_OBJ_PORT_{VLAN, MDB}(): Sanitize The two macros SWITCHDEV_OBJ_PORT_VLAN() and SWITCHDEV_OBJ_PORT_MDB() expand to a container_of() call, yielding an appropriate container of their sole argument. However, due to a name collision, the first argument, i.e. the contained object pointer, is not the only one to get expanded. The third argument, which is a structure member name, and should be kept literal, gets expanded as well. The only safe way to use these two macros is therefore to name the local variable passed to them "obj". To fix this, rename the sole argument of the two macros from "obj" (which collides with the member name) to "OBJ". Additionally, instead of passing "OBJ" to container_of() verbatim, parenthesize it, so that a comma in the passed-in expression doesn't pollute the container_of() invocation. Signed-off-by: Petr Machata Acked-by: Jiri Pirko Reviewed-by: Ido Schimmel Signed-off-by: David S. Miller --- include/net/switchdev.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'include/net/switchdev.h') diff --git a/include/net/switchdev.h b/include/net/switchdev.h index 7b371e7c4bc6..dd969224a9b9 100644 --- a/include/net/switchdev.h +++ b/include/net/switchdev.h @@ -95,8 +95,8 @@ struct switchdev_obj_port_vlan { u16 vid_end; }; -#define SWITCHDEV_OBJ_PORT_VLAN(obj) \ - container_of(obj, struct switchdev_obj_port_vlan, obj) +#define SWITCHDEV_OBJ_PORT_VLAN(OBJ) \ + container_of((OBJ), struct switchdev_obj_port_vlan, obj) /* SWITCHDEV_OBJ_ID_PORT_MDB */ struct switchdev_obj_port_mdb { @@ -105,8 +105,8 @@ struct switchdev_obj_port_mdb { u16 vid; }; -#define SWITCHDEV_OBJ_PORT_MDB(obj) \ - container_of(obj, struct switchdev_obj_port_mdb, obj) +#define SWITCHDEV_OBJ_PORT_MDB(OBJ) \ + container_of((OBJ), struct switchdev_obj_port_mdb, obj) void switchdev_trans_item_enqueue(struct switchdev_trans *trans, void *data, void (*destructor)(void const *), -- cgit v1.2.3-59-g8ed1b