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rxrpc: Fix insufficient receive notification generation

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[ Upstream commit f71dbf2fb2 ]

In rxrpc_input_data(), rxrpc_notify_socket() is called if the base sequence
number of the packet is immediately following the hard-ack point at the end
of the function.  However, this isn't sufficient, since the recvmsg side
may have been advancing the window and then overrun the position in which
we're adding - at which point rx_hard_ack >= seq0 and no notification is
generated.

Fix this by always generating a notification at the end of the input
function.

Without this, a long call may stall, possibly indefinitely.

Fixes: 248f219cb8 ("rxrpc: Rewrite the data and ack handling code")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Howells
2020-01-30 21:50:36 +00:00
committed by Greg Kroah-Hartman
parent b974ac51f5
commit 362f28fc8d
1 changed files with 1 additions and 2 deletions
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3
net/rxrpc/input.c
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@@ -582,8 +582,7 @@ ack:
immediate_ack, true,
rxrpc_propose_ack_input_data);
if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1)
rxrpc_notify_socket(call);
rxrpc_notify_socket(call);
_leave(" [queued]");
}