phonet: properly unshare skbs in phonet_rcv()

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[ Upstream commit 7aaed57c5c ]

Ivaylo Dimitrov reported a regression caused by commit 7866a62104
("dev: add per net_device packet type chains").

skb->dev becomes NULL and we crash in __netif_receive_skb_core().

Before above commit, different kind of bugs or corruptions could happen
without major crash.

But the root cause is that phonet_rcv() can queue skb without checking
if skb is shared or not.

Many thanks to Ivaylo Dimitrov for his help, diagnosis and tests.

Reported-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Tested-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Remi Denis-Courmont <courmisch@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Dumazet 2016-01-12 08:58:00 -08:00 • committed by Greg Kroah-Hartman

parent ca0f94da27

commit f7c1aee0b4

1 changed files with 4 additions and 0 deletions

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net/phonet/af_phonet.c

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