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    Subject[PATCH 4.14 357/496] rxrpc: Fix Tx ring annotation after initial Tx failure
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: David Howells <dhowells@redhat.com>

    [ 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 <dhowells@redhat.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/rxrpc/sendmsg.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    --- a/net/rxrpc/sendmsg.c
    +++ b/net/rxrpc/sendmsg.c
    @@ -92,7 +92,9 @@ static inline void rxrpc_instant_resend(
    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);
    }

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