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| author | Eric Dumazet <edumazet@google.com> | 2016-01-12 08:58:00 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-28 21:57:12 -0800 |
| commit | 131889525019fad148f83c171cf7cf423119ebfe (patch) | |
| tree | b6bc1af4be6947af98c8fc07e2222c9ba3e7523c /net | |
| parent | 6edaf31a2a2238506be4cdd64a37459a893609f9 (diff) | |
| download | lwn-131889525019fad148f83c171cf7cf423119ebfe.tar.gz lwn-131889525019fad148f83c171cf7cf423119ebfe.zip | |
phonet: properly unshare skbs in phonet_rcv()
[ Upstream commit 7aaed57c5c2890634cfadf725173c7c68ea4cb4f ]
Ivaylo Dimitrov reported a regression caused by commit 7866a621043f
("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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/phonet/af_phonet.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c index 5a940dbd74a3..f0229223bf91 100644 --- a/net/phonet/af_phonet.c +++ b/net/phonet/af_phonet.c @@ -377,6 +377,10 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev, struct sockaddr_pn sa; u16 len; + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + return NET_RX_DROP; + /* check we have at least a full Phonet header */ if (!pskb_pull(skb, sizeof(struct phonethdr))) goto out; |