From 36e0f12bbfd3016f495904b35e41c5711707509f Mon Sep 17 00:00:00 2001 From: Taehee Yoo Date: Thu, 26 Jul 2018 23:17:03 +0900 Subject: [PATCH] xdp: add NULL pointer check in __xdp_return() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit rhashtable_lookup() can return NULL. so that NULL pointer check routine should be added. Fixes: 02b55e5657c3 ("xdp: add MEM_TYPE_ZERO_COPY") Signed-off-by: Taehee Yoo Acked-by: Martin KaFai Lau Acked-by: Björn Töpel Signed-off-by: Daniel Borkmann --- net/core/xdp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/xdp.c b/net/core/xdp.c index 9d1f220..6771f18 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -345,7 +345,8 @@ 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); - xa->zc_alloc->free(xa->zc_alloc, handle); + if (!WARN_ON_ONCE(!xa)) + xa->zc_alloc->free(xa->zc_alloc, handle); rcu_read_unlock(); default: /* Not possible, checked in xdp_rxq_info_reg_mem_model() */ -- 2.7.4