From f557206800801410c30e53ce7a27219b2c4cf0ba Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 14 Jan 2009 20:40:03 -0800 Subject: [PATCH] gro: Fix page ref count for skbs freed normally When an skb with page frags is merged into an existing one, we cannibalise its reference count. This is OK when the skb is reused because we set nr_frags to zero in that case. However, for the case where the skb is freed through kfree_skb, we didn't clear nr_frags which causes the page to be freed prematurely. This is fixed by moving the skb resetting into skb_gro_receive. Reported-by: Jeff Kirsher Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/core/dev.c | 6 ------ net/core/skbuff.c | 6 ++++++ 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 7dec715293b1..60377b6c0a80 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2491,12 +2491,6 @@ EXPORT_SYMBOL(napi_gro_receive); void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) { - skb_shinfo(skb)->nr_frags = 0; - - skb->len -= skb->data_len; - skb->truesize -= skb->data_len; - skb->data_len = 0; - __skb_pull(skb, skb_headlen(skb)); skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 5110b359c758..65eac7739033 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2602,6 +2602,12 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); skb_shinfo(p)->nr_frags += skb_shinfo(skb)->nr_frags; + skb_shinfo(skb)->nr_frags = 0; + + skb->truesize -= skb->data_len; + skb->len -= skb->data_len; + skb->data_len = 0; + NAPI_GRO_CB(skb)->free = 1; goto done; } -- 2.20.1