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Code Issues Releases Wiki Activity

wayland: fix a potential race in wait_events

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The read of the wayland display fd in vo_wayland_wait_events was
incorrect and technically vulnerable to race conditions. The correct
usage as per the client api is to use wl_display_prepare_read as well as
wl_display_read_events.
This commit is contained in:
Dudemanguy 2020-07-29 10:05:07 -05:00
parent 6e3d4aa94b
commit 36951ab6a7
1 changed files with 7 additions and 4 deletions
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11
video/out/wayland_common.c
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@ -1660,7 +1660,6 @@ void vo_wayland_wait_frame(struct vo_wayland_state *wl)
void vo_wayland_wait_events(struct vo *vo, int64_t until_time_us)
{
struct vo_wayland_state *wl = vo->wl;
struct wl_display *display = wl->display;
if (wl->display_fd == -1)
return;
@ -1673,20 +1672,24 @@ void vo_wayland_wait_events(struct vo *vo, int64_t until_time_us)
int64_t wait_us = until_time_us - mp_time_us();
int timeout_ms = MPCLAMP((wait_us + 999) / 1000, 0, 10000);
wl_display_dispatch_pending(display);
wl_display_flush(display);
while (wl_display_prepare_read(wl->display) != 0)
wl_display_dispatch_pending(wl->display);
wl_display_flush(wl->display);
poll(fds, 2, timeout_ms);
if (fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
MP_FATAL(wl, "Error occurred on the display fd, closing\n");
wl_display_cancel_read(wl->display);
close(wl->display_fd);
wl->display_fd = -1;
mp_input_put_key(vo->input_ctx, MP_KEY_CLOSE_WIN);
} else {
wl_display_read_events(wl->display);
}
if (fds[0].revents & POLLIN)
wl_display_dispatch(display);
wl_display_dispatch(wl->display);
if (fds[1].revents & POLLIN)
mp_flush_wakeup_pipe(wl->wakeup_pipe[0]);