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Date: Sat, 21 Jul 2018 01:04:45 +0900 From: Taehee Yoo <ap420073@...il.com> To: daniel@...earbox.net, ast@...nel.org Cc: bjorn.topel@...el.com, brouer@...hat.com, netdev@...r.kernel.org, Taehee Yoo <ap420073@...il.com> Subject: [PATCH bpf] xdp: add NULL pointer check in __xdp_return() 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 <ap420073@...il.com> --- 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..1c12bc7 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 (xa) + xa->zc_alloc->free(xa->zc_alloc, handle); rcu_read_unlock(); default: /* Not possible, checked in xdp_rxq_info_reg_mem_model() */ -- 2.9.3
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