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BUG/MEDIUM: h1: Make sure we subscribe before going into idle list.

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In h1_detach(), make sure we subscribe before we call
srv_add_to_idle_list(), not after. As soon as srv_add_to_idle_list() is
called, and it is put in an idle list, another thread can take it, and
we're no longer allowed to subscribe.
This fixes a race condition when another thread grabs a connection as soon
as it is put, the original owner would subscribe, and thus the new thread
would fail to do so, and to activate polling.
This commit is contained in:
Olivier Houchard 2020-03-22 19:56:03 +01:00
parent 18eeb8e815
commit 3c49c1bd5c
1 changed files with 1 additions and 1 deletions
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2
src/mux_h1.c
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@ -2466,13 +2466,13 @@ static void h1_detach(struct conn_stream *cs)
if (!(h1c->conn->flags & CO_FL_PRIVATE)) {
if (h1c->conn->owner == sess)
h1c->conn->owner = NULL;
h1c->conn->xprt->subscribe(h1c->conn, h1c->conn->xprt_ctx, SUB_RETRY_RECV, &h1c->wait_event);
if (!srv_add_to_idle_list(objt_server(h1c->conn->target), h1c->conn, is_not_first)) {
/* The server doesn't want it, let's kill the connection right away */
h1c->conn->mux->destroy(h1c);
TRACE_DEVEL("outgoing connection killed", H1_EV_STRM_END|H1_EV_H1C_END);
goto end;
}
h1c->conn->xprt->subscribe(h1c->conn, h1c->conn->xprt_ctx, SUB_RETRY_RECV, &h1c->wait_event);
return;
}
}