From 2ddafce7f797082ad216657c830afd4546f16e37 Mon Sep 17 00:00:00 2001 From: Ding Hui Date: Thu, 29 Oct 2020 11:22:41 +0800 Subject: [PATCH] vnc: fix resource leak when websocket channel error When we connect to vnc by websocket channel, and disconnect (maybe by some network exception) before handshake, qemu will left CLOSE_WAIT socket and never close it After 04d2529da2 ("ui: convert VNC server to use QIOChannelSocket") and dd154c4d9f ("io: fix handling of EOF / error conditions in websock GSource"), the vnc call qio_channel_add_watch only care about G_IO_IN, but mising G_IO_HUP and G_IO_ERR. When the websocket channel get EOF or error, it cannot callback, because the caller ignore the event, that leads to resource leak We need handle G_IO_HUP and G_IO_ERR event, then cleanup the channel Fixes: 04d2529da2 ("ui: convert VNC server to use QIOChannelSocket") Fixes: dd154c4d9f ("io: fix handling of EOF / error conditions in websock GSource") Cc: qemu-stable@nongnu.org Signed-off-by: Ding Hui Message-id: 20201029032241.11040-1-dinghui@sangfor.com.cn Signed-off-by: Gerd Hoffmann --- ui/vnc-auth-sasl.c | 3 ++- ui/vnc-auth-vencrypt.c | 3 ++- ui/vnc-jobs.c | 3 ++- ui/vnc-ws.c | 20 ++++++++++++++++---- ui/vnc.c | 24 ++++++++++++++++++------ 5 files changed, 40 insertions(+), 13 deletions(-) diff --git a/ui/vnc-auth-sasl.c b/ui/vnc-auth-sasl.c index 0517b2ead9..f67111a366 100644 --- a/ui/vnc-auth-sasl.c +++ b/ui/vnc-auth-sasl.c @@ -111,7 +111,8 @@ size_t vnc_client_write_sasl(VncState *vs) g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vnc_client_io, vs, NULL); } return ret; diff --git a/ui/vnc-auth-vencrypt.c b/ui/vnc-auth-vencrypt.c index f072e16ace..d9c212ff32 100644 --- a/ui/vnc-auth-vencrypt.c +++ b/ui/vnc-auth-vencrypt.c @@ -79,7 +79,8 @@ static void vnc_tls_handshake_done(QIOTask *task, g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_OUT, + vnc_client_io, vs, NULL); start_auth_vencrypt_subauth(vs); } } diff --git a/ui/vnc-jobs.c b/ui/vnc-jobs.c index 929391f85d..dbbfbefe56 100644 --- a/ui/vnc-jobs.c +++ b/ui/vnc-jobs.c @@ -151,7 +151,8 @@ void vnc_jobs_consume_buffer(VncState *vs) } if (vs->disconnecting == FALSE) { vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_OUT, + vnc_client_io, vs, NULL); } } buffer_move(&vs->output, &vs->jobs_buffer); diff --git a/ui/vnc-ws.c b/ui/vnc-ws.c index 95c9703c72..6d79f3e5a5 100644 --- a/ui/vnc-ws.c +++ b/ui/vnc-ws.c @@ -41,13 +41,14 @@ static void vncws_tls_handshake_done(QIOTask *task, g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - QIO_CHANNEL(vs->ioc), G_IO_IN, vncws_handshake_io, vs, NULL); + QIO_CHANNEL(vs->ioc), G_IO_IN | G_IO_HUP | G_IO_ERR, + vncws_handshake_io, vs, NULL); } } gboolean vncws_tls_handshake_io(QIOChannel *ioc G_GNUC_UNUSED, - GIOCondition condition G_GNUC_UNUSED, + GIOCondition condition, void *opaque) { VncState *vs = opaque; @@ -59,6 +60,11 @@ gboolean vncws_tls_handshake_io(QIOChannel *ioc G_GNUC_UNUSED, vs->ioc_tag = 0; } + if (condition & (G_IO_HUP | G_IO_ERR)) { + vnc_client_error(vs); + return TRUE; + } + tls = qio_channel_tls_new_server( vs->ioc, vs->vd->tlscreds, @@ -105,13 +111,14 @@ static void vncws_handshake_done(QIOTask *task, g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vnc_client_io, vs, NULL); } } gboolean vncws_handshake_io(QIOChannel *ioc G_GNUC_UNUSED, - GIOCondition condition G_GNUC_UNUSED, + GIOCondition condition, void *opaque) { VncState *vs = opaque; @@ -122,6 +129,11 @@ gboolean vncws_handshake_io(QIOChannel *ioc G_GNUC_UNUSED, vs->ioc_tag = 0; } + if (condition & (G_IO_HUP | G_IO_ERR)) { + vnc_client_error(vs); + return TRUE; + } + wioc = qio_channel_websock_new_server(vs->ioc); qio_channel_set_name(QIO_CHANNEL(wioc), "vnc-ws-server-websock"); diff --git a/ui/vnc.c b/ui/vnc.c index f006aa1afd..49235056f7 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -1398,7 +1398,8 @@ static size_t vnc_client_write_plain(VncState *vs) g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vnc_client_io, vs, NULL); } return ret; @@ -1435,7 +1436,8 @@ static void vnc_client_write(VncState *vs) g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vnc_client_io, vs, NULL); } vnc_unlock_output(vs); } @@ -1551,6 +1553,12 @@ gboolean vnc_client_io(QIOChannel *ioc G_GNUC_UNUSED, VncState *vs = opaque; assert(vs->magic == VNC_MAGIC); + + if (condition & (G_IO_HUP | G_IO_ERR)) { + vnc_disconnect_start(vs); + return TRUE; + } + if (condition & G_IO_IN) { if (vnc_client_read(vs) < 0) { /* vs is free()ed here */ @@ -1612,7 +1620,8 @@ void vnc_write(VncState *vs, const void *data, size_t len) g_source_remove(vs->ioc_tag); } vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_OUT, + vnc_client_io, vs, NULL); } buffer_append(&vs->output, data, len); @@ -3077,14 +3086,17 @@ static void vnc_connect(VncDisplay *vd, QIOChannelSocket *sioc, vs->websocket = 1; if (vd->tlscreds) { vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vncws_tls_handshake_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vncws_tls_handshake_io, vs, NULL); } else { vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vncws_handshake_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vncws_handshake_io, vs, NULL); } } else { vs->ioc_tag = qio_channel_add_watch( - vs->ioc, G_IO_IN, vnc_client_io, vs, NULL); + vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR, + vnc_client_io, vs, NULL); } vnc_client_cache_addr(vs);