From 4a9fabcd3440357e45b4b52f47478d57858cede4 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 30 Mar 2018 21:04:43 +0100 Subject: [PATCH] rxrpc: Fix Tx ring annotation after initial Tx failure [ Upstream commit 03877bf6a30cca7d4bc3ffabd3c3e9464a7a1a19 ] rxrpc calls have a ring of packets that are awaiting ACK or retransmission and a parallel ring of annotations that tracks the state of those packets. If the initial transmission of a packet on the underlying UDP socket fails then the packet annotation is marked for resend - but the setting of this mark accidentally erases the last-packet mark also stored in the same annotation slot. If this happens, a call won't switch out of the Tx phase when all the packets have been transmitted. Fix this by retaining the last-packet mark and only altering the packet state. Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Signed-off-by: David Howells Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/rxrpc/sendmsg.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c index d2f51d6a253c..016e293681b8 100644 --- a/net/rxrpc/sendmsg.c +++ b/net/rxrpc/sendmsg.c @@ -92,7 +92,9 @@ static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) spin_lock_bh(&call->lock); if (call->state < RXRPC_CALL_COMPLETE) { - call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS; + call->rxtx_annotations[ix] = + (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) | + RXRPC_TX_ANNO_RETRANS; if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) rxrpc_queue_call(call); }