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xwayland: Fix some FD leaks on error paths

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If `meta_xwayland_start_xserver()` returned via an error path, some of
the socket FDs were leaked.

Fix that, and add `steal_fd()` calls to make it clearer that FDs passed
to `g_subprocess_launcher_take_fd()` are transferred to it. There were
no bugs with how `GSubprocessLauncher` was being used.

Spotted while working on
https://gitlab.gnome.org/GNOME/glib/-/issues/2332.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1738>
This commit is contained in:
Philip Withnall 2021-02-19 18:04:25 +00:00 committed by Marge Bot
parent 36352f44f9
commit bec456ba0a
1 changed files with 24 additions and 5 deletions
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29
src/wayland/meta-xwayland.c
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@ -837,6 +837,14 @@ on_displayfd_ready (int fd,
return G_SOURCE_REMOVE;
}
static int
steal_fd (int *fd_ptr)
{
int fd = *fd_ptr;
*fd_ptr = -1;
return fd;
}
void
meta_xwayland_start_xserver (MetaXWaylandManager *manager,
GCancellable *cancellable,
@ -880,6 +888,9 @@ meta_xwayland_start_xserver (MetaXWaylandManager *manager,
if (socketpair (AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, displayfd) < 0)
{
close (xwayland_client_fd[0]);
close (xwayland_client_fd[1]);
g_task_return_new_error (task,
G_IO_ERROR,
g_io_error_from_errno (errno),
@ -903,11 +914,16 @@ meta_xwayland_start_xserver (MetaXWaylandManager *manager,
launcher = g_subprocess_launcher_new (flags);
g_subprocess_launcher_take_fd (launcher, xwayland_client_fd[1], 3);
g_subprocess_launcher_take_fd (launcher, manager->public_connection.abstract_fd, 4);
g_subprocess_launcher_take_fd (launcher, manager->public_connection.unix_fd, 5);
g_subprocess_launcher_take_fd (launcher, displayfd[1], 6);
g_subprocess_launcher_take_fd (launcher, manager->private_connection.abstract_fd, 7);
g_subprocess_launcher_take_fd (launcher,
steal_fd (&xwayland_client_fd[1]), 3);
g_subprocess_launcher_take_fd (launcher,
steal_fd (&manager->public_connection.abstract_fd), 4);
g_subprocess_launcher_take_fd (launcher,
steal_fd (&manager->public_connection.unix_fd), 5);
g_subprocess_launcher_take_fd (launcher,
steal_fd (&displayfd[1]), 6);
g_subprocess_launcher_take_fd (launcher,
steal_fd (&manager->private_connection.abstract_fd), 7);
g_subprocess_launcher_setenv (launcher, "WAYLAND_SOCKET", "3", TRUE);
@ -954,6 +970,9 @@ meta_xwayland_start_xserver (MetaXWaylandManager *manager,
if (!manager->proc)
{
close (displayfd[0]);
close (xwayland_client_fd[0]);
g_task_return_error (task, error);
return;
}