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| author |   Taehee Yoo <ap420073@gmail.com> | 2018-07-26 23:17:03 +0900 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-07-27 03:43:16 +0200 |
| commit | 36e0f12bbfd3016f495904b35e41c5711707509f (patch) | |
| tree | 84480035ecd09784ab8398e884c9652a62ed9f6e /net/core/xdp.c | |
| parent | xsk: fix poll/POLLIN premature returns (diff) | |
| download | linux-dev-36e0f12bbfd3016f495904b35e41c5711707509f.tar.xz linux-dev-36e0f12bbfd3016f495904b35e41c5711707509f.zip | |
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@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/core/xdp.c')
| -rw-r--r-- | net/core/xdp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/xdp.c b/net/core/xdp.c index 9d1f22072d5d..6771f1855b96 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() */ |