gro: Disable frag0 optimization on IPv6 ext headers

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commit 57ea52a865 upstream.

The GRO fast path caches the frag0 address.  This address becomes
invalid if frag0 is modified by pskb_may_pull or its variants.
So whenever that happens we must disable the frag0 optimization.

This is usually done through the combination of gro_header_hard
and gro_header_slow, however, the IPv6 extension header path did
the pulling directly and would continue to use the GRO fast path
incorrectly.

This patch fixes it by disabling the fast path when we enter the
IPv6 extension header path.

Fixes: 78a478d0ef ("gro: Inline skb_gro_header and cache frag0 virtual address")
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Herbert Xu 2017-01-10 12:24:15 -08:00 • committed by Ben Hutchings

parent 36e2283548

commit 62015343b7

2 changed files with 8 additions and 2 deletions

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9

include/linux/netdevice.h

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1

net/ipv6/ip6_offload.c

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