Revert "xdp: add NULL pointer check in __xdp_return()"

This reverts commit 36e0f12bbfd3016f495904b35e41c5711707509f.

The reverted commit adds a WARN to check against NULL entries in the
mem_id_ht rhashtable. Any kernel path implementing the XDP (generic or
driver) fast path is required to make a paired
xdp_rxq_info_reg/xdp_rxq_info_unreg call for proper function. In
addition, a driver using a different allocation scheme than the
default MEM_TYPE_PAGE_SHARED is required to additionally call
xdp_rxq_info_reg_mem_model.

For MEM_TYPE_ZERO_COPY, an xdp_rxq_info_reg_mem_model call ensures
that the mem_id_ht rhashtable has a properly inserted allocator id. If
not, this would be a driver bug. A NULL pointer kernel OOPS is
preferred to the WARN.

Suggested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/net/core/xdp.c b/net/core/xdp.c
index c013b83..5728538 100644 (file)
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -348,8 +348,7 @@ static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
                rcu_read_lock();
                /* mem->id is valid, checked in xdp_rxq_info_reg_mem_model() */
                xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
-               if (!WARN_ON_ONCE(!xa))
-                       xa->zc_alloc->free(xa->zc_alloc, handle);
+               xa->zc_alloc->free(xa->zc_alloc, handle);
                rcu_read_unlock();
        default:
                /* Not possible, checked in xdp_rxq_info_reg_mem_model() */