From: <gregkh@linuxfoundation.org>
To: andreyknvl@google.com, davem@davemloft.net, edumazet@google.com,
gregkh@linuxfoundation.org
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "dccp: fix freeing skb too early for IPV6_RECVPKTINFO" has been added to the 4.9-stable tree
Date: Thu, 23 Feb 2017 21:17:23 +0100 [thread overview]
Message-ID: <148788104324141@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
dccp: fix freeing skb too early for IPV6_RECVPKTINFO
to the 4.9-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:
dccp-fix-freeing-skb-too-early-for-ipv6_recvpktinfo.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Thu Feb 23 21:13:05 CET 2017
From: Andrey Konovalov <andreyknvl@google.com>
Date: Thu, 16 Feb 2017 17:22:46 +0100
Subject: dccp: fix freeing skb too early for IPV6_RECVPKTINFO
From: Andrey Konovalov <andreyknvl@google.com>
[ Upstream commit 5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4 ]
In the current DCCP implementation an skb for a DCCP_PKT_REQUEST packet
is forcibly freed via __kfree_skb in dccp_rcv_state_process if
dccp_v6_conn_request successfully returns.
However, if IPV6_RECVPKTINFO is set on a socket, the address of the skb
is saved to ireq->pktopts and the ref count for skb is incremented in
dccp_v6_conn_request, so skb is still in use. Nevertheless, it gets freed
in dccp_rcv_state_process.
Fix by calling consume_skb instead of doing goto discard and therefore
calling __kfree_skb.
Similar fixes for TCP:
fb7e2399ec17f1004c0e0ccfd17439f8759ede01 [TCP]: skb is unexpectedly freed.
0aea76d35c9651d55bbaf746e7914e5f9ae5a25d tcp: SYN packets are now
simply consumed
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/dccp/input.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -606,7 +606,8 @@ int dccp_rcv_state_process(struct sock *
if (inet_csk(sk)->icsk_af_ops->conn_request(sk,
skb) < 0)
return 1;
- goto discard;
+ consume_skb(skb);
+ return 0;
}
if (dh->dccph_type == DCCP_PKT_RESET)
goto discard;
Patches currently in stable-queue which might be from andreyknvl@google.com are
queue-4.9/dccp-fix-freeing-skb-too-early-for-ipv6_recvpktinfo.patch
queue-4.9/ip-fix-ip_checksum-handling.patch
queue-4.9/net-llc-avoid-bug_on-in-skb_orphan.patch
reply other threads:[~2017-02-23 20:17 UTC|newest]
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