This is a note to let you know that I've just added the patch titled
net: fix socket refcounting in skb_complete_tx_timestamp()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-fix-socket-refcounting-in-skb_complete_tx_timestamp.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sat Mar 18 22:38:09 CST 2017
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Fri, 3 Mar 2017 21:01:03 -0800
Subject: net: fix socket refcounting in skb_complete_tx_timestamp()
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 9ac25fc063751379cb77434fef9f3b088cd3e2f7 ]
TX skbs do not necessarily hold a reference on skb->sk->sk_refcnt
By the time TX completion happens, sk_refcnt might be already 0.
sock_hold()/sock_put() would then corrupt critical state, like
sk_wmem_alloc and lead to leaks or use after free.
Fixes: 62bccb8cdb69 ("net-timestamp: Make the clone operation stand-alone from phy timestamping")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: Soheil Hassas Yeganeh <soheil@xxxxxxxxxx>
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Acked-by: Soheil Hassas Yeganeh <soheil@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/skbuff.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3678,13 +3678,14 @@ void skb_complete_tx_timestamp(struct sk
if (!skb_may_tx_timestamp(sk, false))
return;
- /* take a reference to prevent skb_orphan() from freeing the socket */
- sock_hold(sk);
-
- *skb_hwtstamps(skb) = *hwtstamps;
- __skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND);
-
- sock_put(sk);
+ /* Take a reference to prevent skb_orphan() from freeing the socket,
+ * but only if the socket refcount is not zero.
+ */
+ if (likely(atomic_inc_not_zero(&sk->sk_refcnt))) {
+ *skb_hwtstamps(skb) = *hwtstamps;
+ __skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND);
+ sock_put(sk);
+ }
}
EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.4/tcp-fix-various-issues-for-sockets-morphing-to-listen-state.patch
queue-4.4/dccp-fix-use-after-free-in-dccp_feat_activate_values.patch
queue-4.4/net-fix-socket-refcounting-in-skb_complete_tx_timestamp.patch
queue-4.4/net-net_enable_timestamp-can-be-called-from-irq-contexts.patch
queue-4.4/dccp-unlock-sock-before-calling-sk_free.patch
queue-4.4/net-don-t-call-strlen-on-the-user-buffer-in-packet_bind_spkt.patch
queue-4.4/net-fix-socket-refcounting-in-skb_complete_wifi_ack.patch