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From 74eb4b3e1fcc6d36de0116c2fbbaa308191a1ab7 Mon Sep 17 00:00:00 2001
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From: "Daniel P. Berrange" <berrange@redhat.com>
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Date: Thu, 8 Feb 2018 17:50:15 +0100
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Subject: [PATCH 01/27] vnc: Fix qemu crashed when vnc client disconnect
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suddenly
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RH-Author: Daniel P. Berrange <berrange@redhat.com>
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Message-id: <20180208175041.5634-2-berrange@redhat.com>
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Patchwork-id: 78947
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v1 01/27] vnc: Fix qemu crashed when vnc client disconnect suddenly
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Bugzilla: 1527405
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: "Gonglei (Arei)" <arei.gonglei@huawei.com>
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Hi,
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When I use RealVNC viewer client (http://www.realvnc.com/) to connect vnc server,
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the client disconnect suddenly, and I click reconnect button immediately, then the Qemu crashed.
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In the function vnc_worker_thread_loop, will call vnc_async_encoding_start
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to set the local vs->output buffer by global queue's buffer. Then send rectangles to
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the vnc client call function vnc_send_framebuffer_update. Finally, Under normal circumstances,
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call vnc_async_encoding_end to set the global queue'buffer by the local vs->output conversely.
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When the vnc client disconnect, the job->vs->csock will be set to -1. And the current prcoess
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logic will goto disconnected partion without call function vnc_async_encoding_end.
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But, the function vnc_send_framebuffer_update will call buffer_reserve, which
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maybe call g_realloc reset the local vs's buffer, meaning the global queue's buffer is modified also.
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If anyone use the original global queue's buffer memory will cause corruption and then crash qemu.
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This patch assure the function vnc_async_encoding_end being called
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even though the vnc client disconnect suddenly.
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Signed-off-by: Gonglei <arei.gonglei@huawei.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit e3c1adf16e38714ebd761dd02517dd07760ba6d2)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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ui/vnc-jobs.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/ui/vnc-jobs.c b/ui/vnc-jobs.c
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index 2d3fce8..a141f40 100644
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--- a/ui/vnc-jobs.c
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+++ b/ui/vnc-jobs.c
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@@ -252,6 +252,8 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
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if (job->vs->csock == -1) {
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vnc_unlock_display(job->vs->vd);
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+ /* Copy persistent encoding data */
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+ vnc_async_encoding_end(job->vs, &vs);
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goto disconnected;
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}
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@@ -278,6 +280,9 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
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vnc_async_encoding_end(job->vs, &vs);
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qemu_bh_schedule(job->vs->bh);
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+ } else {
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+ /* Copy persistent encoding data */
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+ vnc_async_encoding_end(job->vs, &vs);
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}
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vnc_unlock_output(job->vs);
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--
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1.8.3.1
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