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xdp: linearize skb in netif_receive_generic_xdp()

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In netif_receive_generic_xdp(), it is necessary to linearize all
nonlinear skb. However, in current implementation, skb with
troom <= 0 are not linearized. This patch fixes this by calling
skb_linearize() for all nonlinear skb.

Fixes: de8f3a83b0 ("bpf: add meta pointer for direct access")
Signed-off-by: Song Liu <songliubraving@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Song Liu 2017-12-14 17:17:56 -08:00 committed by Daniel Borkmann
parent 8c8f67a46f
commit 2d17d8d79e
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -3904,7 +3904,7 @@ static u32 netif_receive_generic_xdp(struct sk_buff *skb,
hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0,
troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) troom > 0 ? troom + 128 : 0, GFP_ATOMIC))
goto do_drop; goto do_drop;
if (troom > 0 && __skb_linearize(skb)) if (skb_linearize(skb))
goto do_drop; goto do_drop;
} }