Commit 5169043e authored by Herbert Xu's avatar Herbert Xu Committed by Greg Kroah-Hartman

gro: Enter slow-path if there is no tailroom

[ Upstream commit 1272ce87 ]

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: cb18978c ("gro: Open-code final pskb_may_pull")
Reported-by: default avatarSlava Shwartsman <slavash@mellanox.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0d3b9c27
......@@ -4187,7 +4187,8 @@ 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);
}
}
......
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