diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-02-12 14:03:52 -0800 |
|---|---|---|
| committer | Drgravy <drg113001@gmail.com> | 2017-03-15 17:51:13 -0500 |
| commit | a63677398c97a565f3b98f6e26bff2edb7dc4b1c (patch) | |
| tree | f87c01e42c52b99d44214e2fb27bcfe0c1dd32d6 /net | |
| parent | 20a3b4ee0f3dba455a73bc959713ba1b187eb001 (diff) | |
It seems nobody used LLC since linux-3.12.
Fortunately fuzzers like syzkaller still know how to run this code,
otherwise it would be no fun.
Setting skb->sk without skb->destructor leads to all kinds of
bugs, we now prefer to be very strict about it.
Ideally here we would use skb_set_owner() but this helper does not exist yet,
only CAN seems to have a private helper for that.
Change-Id: I17412f0afe525d556ab072a7b89d5839845a2ce7
Fixes: 376c7311bdb6 ("net: add a temporary sanity check in skb_orphan()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/llc/llc_conn.c | 3 | ||||
| -rw-r--r-- | net/llc/llc_sap.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c index ba137a6a224..f3125b92c3e 100644 --- a/net/llc/llc_conn.c +++ b/net/llc/llc_conn.c @@ -821,7 +821,10 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb) * another trick required to cope with how the PROCOM state * machine works. -acme */ + skb_orphan(skb); + sock_hold(sk); skb->sk = sk; + skb->destructor = sock_efree; } if (!sock_owned_by_user(sk)) llc_conn_rcv(sk, skb); diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c index 94e7fca75b8..687fe7409e1 100644 --- a/net/llc/llc_sap.c +++ b/net/llc/llc_sap.c @@ -294,7 +294,10 @@ static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb, ev->type = LLC_SAP_EV_TYPE_PDU; ev->reason = 0; + skb_orphan(skb); + sock_hold(sk); skb->sk = sk; + skb->destructor = sock_efree; llc_sap_state_process(sap, skb); } |