tipc: fix socket flow control accounting error at tipc_recv_stream
authorParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Mon, 24 Apr 2017 13:00:43 +0000 (15:00 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 25 Apr 2017 15:45:38 +0000 (11:45 -0400)
commit05ff8378975a9d5fdde19104b62163d2902926fb
tree71f1dae3165074cbdea3147a6689a1900e0ce02f
parent3364d61c92ecca7a8da990659c4b0ae1fcf0fcfb
tipc: fix socket flow control accounting error at tipc_recv_stream

Until now in tipc_recv_stream(), we update the received
unacknowledged bytes based on a stack variable and not based on the
actual message size.
If the user buffer passed at tipc_recv_stream() is smaller than the
received skb, the size variable in stack differs from the actual
message size in the skb. This leads to a flow control accounting
error causing permanent congestion.

In this commit, we fix this accounting error by always using the
size of the incoming message.

Fixes: 10724cc7bb78 ("tipc: redesign connection-level flow control")
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/tipc/socket.c