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3e9201e4fe
Add mod_flow() and the mod-flow CLI command to ovs-dpctl.py, exercising OVS_FLOW_CMD_SET. Add test_flow_set which first modifies an existing flow with new actions and verifies the change via traffic, then modifies the same flow without actions and verifies the kernel handles the no-actions case gracefully. The no-actions path is unreachable from userspace OVS tools (dpctl mod-flow requires actions) but reachable via raw netlink. This is the code path where Adrian Moreno found a possible kfree_skb of ERR_PTR when reply allocation fails after locking. Make parse() skip OVS_FLOW_ATTR_ACTIONS when actstr is None so the kernel enters the post-lock allocation branch in ovs_flow_cmd_set(). After the no-actions set, verify via dump-flows that the flow retained its drop action. Suggested-by: Aaron Conole <aconole@redhat.com> Signed-off-by: Minxi Hou <houminxi@gmail.com> Reviewed-by: Aaron Conole <aconole@redhat.com> Link: https://patch.msgid.link/20260609165725.107484-1-houminxi@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>