From: Eric Dumazet <edumazet@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ Upstream commit 8b74d439e1697110c5e5c600643e823eb1dd0762 ]
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.
[js] take sock_efree from 62bccb8cdb6905
Fixes: 376c7311bdb6 ("net: add a temporary sanity check in skb_orphan()")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
include/net/sock.h | 1 +
net/core/sock.c | 6 ++++++
net/llc/llc_conn.c | 3 +++
net/llc/llc_sap.c | 3 +++
4 files changed, 13 insertions(+)
diff --git a/include/net/sock.h b/include/net/sock.h
index 238e934dd3c3..467d2f810fb3 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1554,6 +1554,7 @@ extern struct sk_buff *sock_rmalloc(struct sock *sk,
extern void sock_wfree(struct sk_buff *skb);
extern void skb_orphan_partial(struct sk_buff *skb);
extern void sock_rfree(struct sk_buff *skb);
+void sock_efree(struct sk_buff *skb);
extern void sock_edemux(struct sk_buff *skb);
extern int sock_setsockopt(struct socket *sock, int level,
diff --git a/net/core/sock.c b/net/core/sock.c
index 7fa427ed41bc..d765d6411a5b 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1656,6 +1656,12 @@ void sock_rfree(struct sk_buff *skb)
}
EXPORT_SYMBOL(sock_rfree);
+void sock_efree(struct sk_buff *skb)
+{
+ sock_put(skb->sk);
+}
+EXPORT_SYMBOL(sock_efree);
+
void sock_edemux(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index cd8724177965..6d36b3241b98 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 e5850699098e..4ee1e1142e8e 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -290,7 +290,10 @@ 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);
}
--
2.12.0