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authorHerbert Xu <herbert@gondor.apana.org.au>2017-01-10 23:24:01 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-11 05:26:12 +0300
commit1272ce87fa017ca4cf32920764d879656b7a005a (patch)
tree77213de2de22ae61ead334aaaaab20fc37c2b93c /net/core
parent9f9b74ef896792399dc7b5121896b9c963db80fb (diff)
downloadlinux-1272ce87fa017ca4cf32920764d879656b7a005a.tar.xz
gro: Enter slow-path if there is no tailroom
The GRO path has a fast-path where we avoid calling pskb_may_pull and pskb_expand by directly accessing frag0. However, this should only be done if we have enough tailroom in the skb as otherwise we'll have to expand it later anyway. This patch adds the check by capping frag0_len with the skb tailroom. Fixes: cb18978cbf45 ("gro: Open-code final pskb_may_pull") Reported-by: Slava Shwartsman <slavash@mellanox.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 8db5a0b4b520..88d2907ca2cd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4441,7 +4441,8 @@ static void skb_gro_reset_offset(struct sk_buff *skb)
pinfo->nr_frags &&
!PageHighMem(skb_frag_page(frag0))) {
NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
- NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
+ NAPI_GRO_CB(skb)->frag0_len = min(skb_frag_size(frag0),
+ skb->end - skb->tail);
}
}