[PATHC] net: napi_reuse_skb() should check pfmemalloc

[Eric Dumazet]

From: Eric Dumazet <edumazet@xxxxxxxxxx>

Do not reuse skb if it was pfmemalloc tainted, otherwise
future frame might be dropped anyway.

Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
---
 net/core/dev.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index b793e3521a36..945bbd001359 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4157,6 +4157,10 @@ EXPORT_SYMBOL(napi_gro_receive);
 
 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
 {
+	if (unlikely(skb->pfmemalloc)) {
+		consume_skb(skb);
+		return;
+	}
 	__skb_pull(skb, skb_headlen(skb));
 	/* restore the reserve we had after netdev_alloc_skb_ip_align() */
 	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));


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