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From: | Yuriy Pudgorodskiy |
Subject: | Re: [Qemu-devel] [PATCH 1/2] qga: fix fd leak with guest-exec i/o channels |
Date: | Thu, 7 Apr 2016 14:22:13 +0300 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 |
On 4/7/2016 2:53 AM, Michael Roth wrote:
Quoting Denis V. Lunev (2016-04-06 00:43:30)From: Yuriy Pudgorodskiy <address@hidden> Signed-off-by: Yuriy Pudgorodskiy <address@hidden> Signed-off-by: Denis V. Lunev <address@hidden> CC: Michael Roth <address@hidden> --- qga/commands.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/qga/commands.c b/qga/commands.c index e091ee1..9ad2f7d 100644 --- a/qga/commands.c +++ b/qga/commands.c @@ -446,6 +446,7 @@ GuestExec *qmp_guest_exec(const char *path, g_io_channel_set_encoding(in_ch, NULL, NULL); g_io_channel_set_buffered(in_ch, false); g_io_channel_set_flags(in_ch, G_IO_FLAG_NONBLOCK, NULL); + g_io_channel_set_close_on_unref(in_ch, true); g_io_add_watch(in_ch, G_IO_OUT, guest_exec_input_watch, &gei->in); } @@ -461,6 +462,8 @@ GuestExec *qmp_guest_exec(const char *path, g_io_channel_set_encoding(err_ch, NULL, NULL); g_io_channel_set_buffered(out_ch, false); g_io_channel_set_buffered(err_ch, false); + g_io_channel_set_close_on_unref(out_ch, true); + g_io_channel_set_close_on_unref(err_ch, true);I don't seem any harm in adding these for safety, but don't the handles get closed via the g_io_channel_shutdown(ch, ...) calls we make prior to unref in guest_exec_{output,input}_watch()? Or is there another unref path I'm missing?
Well, it may be fixed with explicit g_io_channel_shutdown(), and may be it is a better fix style, but it needs to be fixed somehow. We missed in our code a call
to shutdown in guest_exec_output_watch(): diff --git a/qga/commands.c b/qga/commands.c index 45688c8..9acb2f6 100644 --- a/qga/commands.c +++ b/qga/commands.c @@ -373,6 +373,7 @@ static gboolean guest_exec_output_watch(GIOChannel *ch, return true; close: + g_io_channel_shutdown(ch, true, NULL); g_io_channel_unref(ch); g_atomic_int_set(&p->closed, 1); return false;
g_io_add_watch(out_ch, G_IO_IN | G_IO_HUP, guest_exec_output_watch, &gei->out); g_io_add_watch(err_ch, G_IO_IN | G_IO_HUP, -- 2.1.4.
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