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Groups > linux.kernel > #1485626
| From | David Howells <dhowells@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH net-next 12/14] rxrpc: Don't transmit an ACK if there's no reason set |
| Date | 2016-09-18 01:20 +0200 |
| Message-ID | <six3P-mU-7@gated-at.bofh.it> (permalink) |
| References | <six3P-mU-3@gated-at.bofh.it> |
| Organization | Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 |
Don't transmit an ACK if call->ackr_reason in unset. There's the
possibility of a race between recvmsg() sending an ACK and the background
processing thread trying to send the same one.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/output.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 06a9aca739d1..aa0507214b31 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -137,6 +137,11 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
switch (type) {
case RXRPC_PACKET_TYPE_ACK:
spin_lock_bh(&call->lock);
+ if (!call->ackr_reason) {
+ spin_unlock_bh(&call->lock);
+ ret = 0;
+ goto out;
+ }
n = rxrpc_fill_out_ack(call, pkt);
call->ackr_reason = 0;
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[PATCH net-next 00/14] rxrpc: Fixes & miscellany David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 09/14] rxrpc: Fix unexposed client conn release David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 12/14] rxrpc: Don't transmit an ACK if there's no reason set David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 07/14] rxrpc: Fix the putting of client connections David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 14/14] rxrpc: Fix the basic transmit DATA packet content size at 1412 bytes David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 06/14] rxrpc: Purge the to_be_accepted queue on socket release David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 01/14] rxrpc: Remove some whitespace. David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 03/14] rxrpc: Check the return value of rxrpc_locate_data() David Howells <dhowells@redhat.com> - 2016-09-18 01:20 +0200 [PATCH net-next 11/14] rxrpc: Fix retransmission algorithm David Howells <dhowells@redhat.com> - 2016-09-18 01:30 +0200 [PATCH net-next 05/14] rxrpc: Record calls that need to be accepted David Howells <dhowells@redhat.com> - 2016-09-18 01:30 +0200 [PATCH net-next 13/14] rxrpc: Be consistent about switch value in rxrpc_send_call_packet() David Howells <dhowells@redhat.com> - 2016-09-18 01:30 +0200 [PATCH net-next 02/14] rxrpc: Move the check of rx_pkt_offset from rxrpc_locate_data() to caller David Howells <dhowells@redhat.com> - 2016-09-18 01:30 +0200 [PATCH net-next 10/14] rxrpc: Fix the parsing of soft-ACKs David Howells <dhowells@redhat.com> - 2016-09-18 01:30 +0200 Re: [PATCH net-next 00/14] rxrpc: Fixes & miscellany David Miller <davem@davemloft.net> - 2016-09-18 13:30 +0200 Re: [PATCH net-next 00/14] rxrpc: Fixes & miscellany David Miller <davem@davemloft.net> - 2016-09-19 08:00 +0200
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