openvswitch: Use kmalloc_size_roundup() to match ksize() usage

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2163374
Upstream Status: linux.git

commit ab3f782
Author: Kees Cook <keescook@chromium.org>
Date:   Tue Oct 18 02:06:33 2022 -0700

    openvswitch: Use kmalloc_size_roundup() to match ksize() usage

    Round up allocations with kmalloc_size_roundup() so that openvswitch's
    use of ksize() is always accurate and no special handling of the memory
    is needed by KASAN, UBSAN_BOUNDS, nor FORTIFY_SOURCE.

    Cc: Pravin B Shelar <pshelar@ovn.org>
    Cc: dev@openvswitch.org
    Signed-off-by: Kees Cook <keescook@chromium.org>
    Link: https://lore.kernel.org/r/20221018090628.never.537-kees@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Antoine Tenart <atenart@redhat.com>

Author: atenart

net/openvswitch/flow_netlink.c

@@ -2280,7 +2280,7 @@ static struct sw_flow_actions *nla_alloc_flow_actions(int size)
 
 	WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE);
 
-	sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
+	sfa = kmalloc(kmalloc_size_roundup(sizeof(*sfa) + size), GFP_KERNEL);
 	if (!sfa)
 		return ERR_PTR(-ENOMEM);