netdev - [PATCH bpf] xdp: linearize skb in netif_receive_generic

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Message-ID: <20171215011756.573758-1-songliubraving@fb.com>
Date:   Thu, 14 Dec 2017 17:17:56 -0800
From:   Song Liu <songliubraving@...com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>, Song Liu <songliubraving@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: [PATCH bpf] xdp: linearize skb in netif_receive_generic_xdp()

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: de8f3a83b0a0 ("bpf: add meta pointer for direct access")
Signed-off-by: Song Liu <songliubraving@...com>
Acked-by: Martin KaFai Lau <kafai@...com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Alexei Starovoitov <ast@...nel.org>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index f47e96b..01ee854 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3904,7 +3904,7 @@ static u32 netif_receive_generic_xdp(struct sk_buff *skb,
 				     hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0,
 				     troom > 0 ? troom + 128 : 0, GFP_ATOMIC))
 			goto do_drop;
-		if (troom > 0 && __skb_linearize(skb))
+		if (skb_linearize(skb))
 			goto do_drop;
 	}
 
-- 
2.9.5