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59 lines
1.7 KiB
Diff
59 lines
1.7 KiB
Diff
From 8b74d439e1697110c5e5c600643e823eb1dd0762 Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Sun, 12 Feb 2017 14:03:52 -0800
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Subject: net/llc: avoid BUG_ON() in skb_orphan()
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It seems nobody used LLC since linux-3.12.
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Fortunately fuzzers like syzkaller still know how to run this code,
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otherwise it would be no fun.
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Setting skb->sk without skb->destructor leads to all kinds of
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bugs, we now prefer to be very strict about it.
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Ideally here we would use skb_set_owner() but this helper does not exist yet,
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only CAN seems to have a private helper for that.
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Fixes: 376c7311bdb6 ("net: add a temporary sanity check in skb_orphan()")
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/llc/llc_conn.c | 3 +++
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net/llc/llc_sap.c | 3 +++
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2 files changed, 6 insertions(+)
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diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
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index 3e821da..8bc5a1b 100644
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--- a/net/llc/llc_conn.c
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+++ b/net/llc/llc_conn.c
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@@ -821,7 +821,10 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
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* another trick required to cope with how the PROCOM state
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* machine works. -acme
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*/
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+ skb_orphan(skb);
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+ sock_hold(sk);
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skb->sk = sk;
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+ skb->destructor = sock_efree;
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}
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if (!sock_owned_by_user(sk))
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llc_conn_rcv(sk, skb);
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diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
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index d0e1e80..5404d0d 100644
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--- a/net/llc/llc_sap.c
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+++ b/net/llc/llc_sap.c
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@@ -290,7 +290,10 @@ static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb,
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ev->type = LLC_SAP_EV_TYPE_PDU;
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ev->reason = 0;
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+ skb_orphan(skb);
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+ sock_hold(sk);
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skb->sk = sk;
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+ skb->destructor = sock_efree;
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llc_sap_state_process(sap, skb);
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}
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--
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cgit v1.1
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