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| author | Eric Dumazet <edumazet@google.com> | 2016-01-12 08:58:00 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-01-12 12:05:38 -0500 |
| commit | 7aaed57c5c2890634cfadf725173c7c68ea4cb4f (patch) | |
| tree | 1e77e3616c4ac78cba6eb94d6776423f248ce4ce /net/phonet | |
| parent | d461873272169a3fc3a8d155d7b1c92e9d97b419 (diff) | |
| download | linux-7aaed57c5c2890634cfadf725173c7c68ea4cb4f.tar.gz linux-7aaed57c5c2890634cfadf725173c7c68ea4cb4f.tar.bz2 linux-7aaed57c5c2890634cfadf725173c7c68ea4cb4f.zip | |
phonet: properly unshare skbs in phonet_rcv()
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>
Diffstat (limited to 'net/phonet')
| -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 10d42f3220ab..f925753668a7 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; |