Re: [PATCH net] sunrpc: fix UDP memory accounting
flat view
From: Benjamin Coddington <hidden>
Date: 2016-08-30 16:28:07
Also in:
linux-nfs
On 25 Aug 2016, at 12:42, Paolo Abeni wrote:
The commit f9b2ee714c5c ("SUNRPC: Move UDP receive data path
into a workqueue context"), as a side effect, moved the
skb_free_datagram() call outside the scope of the related socket
lock, but UDP sockets require such lock to be held for proper
memory accounting.
Fix it by replacing skb_free_datagram() with
skb_free_datagram_locked().
Fixes: f9b2ee714c5c ("SUNRPC: Move UDP receive data path into a workqueue context")
Reported-and-tested-by: Jan Stancek <redacted>
Signed-off-by: Paolo Abeni <redacted>
Thanks for finding this. A similar fix in 2009 for svcsock.c was done by Eric Dumazet:
9d410c796067 ("net: fix sk_forward_alloc corruption")
skb_free_datagram_locked() is used for all xprt types in svcsock.c, should we use
it for the xs_local_transport as well in xprtsock.c?
Ben
quoted hunk
--- net/sunrpc/xprtsock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 8ede3bc..bf16883 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c@@ -1074,7 +1074,7 @@ static void xs_udp_data_receive(struct sock_xprt *transport) skb = skb_recv_datagram(sk, 0, 1, &err); if (skb != NULL) { xs_udp_data_read_skb(&transport->xprt, sk, skb); - skb_free_datagram(sk, skb); + skb_free_datagram_locked(sk, skb); continue; } if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))-- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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