[PATCH 3.16 36/55] gro: fix aggregation for skb using frag_list

From: Greg Kroah-Hartman
Date: Sun Oct 12 2014 - 22:28:55 EST

3.16-stable review patch. If anyone has any objections, please let me know.


From: Eric Dumazet <edumazet@xxxxxxxxxx>

[ Upstream commit 73d3fe6d1c6d840763ceafa9afae0aaafa18c4b5 ]

In commit 8a29111c7ca6 ("net: gro: allow to build full sized skb")
I added a regression for linear skb that traditionally force GRO
to use the frag_list fallback.

Erez Shitrit found that at most two segments were aggregated and
the "if (skb_gro_len(p) != pinfo->gso_size)" test was failing.

This is because pinfo at this spot still points to the last skb in the
chain, instead of the first one, where we find the correct gso_size

Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Fixes: 8a29111c7ca6 ("net: gro: allow to build full sized skb")
Reported-by: Erez Shitrit <erezsh@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/core/skbuff.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3152,6 +3152,9 @@ int skb_gro_receive(struct sk_buff **hea
goto done;
+ /* switch back to head shinfo */
+ pinfo = skb_shinfo(p);
if (pinfo->frag_list)
goto merge;
if (skb_gro_len(p) != pinfo->gso_size)

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