net: fix possible user-after-free in skb_ext_add()

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On cow we can free the old extension: we must avoid dereferencing
such extension after skb_ext_maybe_cow(). Since 'new' contents
are always equal to 'old' after the copy, we can fix the above
accessing the relevant data using 'new'.

Fixes: df5042f4c5 ("sk_buff: add skb extension infrastructure")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Paolo Abeni 2018-12-21 19:03:13 +01:00 • committed by David S. Miller

parent 7fa4bd739f

commit e94e50bd88

1 changed files with 2 additions and 2 deletions

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net/core/skbuff.c

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