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server: fix error handling when adding socket

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When some function during adding socket fails, it must clean
everything it set or we can get funky errors.

This patch fixes:
http://lists.freedesktop.org/archives/wayland-devel/2014-August/016331.html

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Marek Chalupa 2014-08-06 11:21:59 +02:00 • committed by Pekka Paalanen
parent 4c7d1af70b
commit 3a84e45a30
1 changed files with 16 additions and 7 deletions
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23
src/wayland-server.c
View file

@ -1035,24 +1035,20 @@ wl_socket_lock(struct wl_socket *socket)
if (socket->fd_lock < 0) {
wl_log("unable to open lockfile %s check permissions\n",
socket->lock_addr);
return -1;
goto err;
}
if (flock(socket->fd_lock, LOCK_EX | LOCK_NB) < 0) {
wl_log("unable to lock lockfile %s, maybe another compositor is running\n",
socket->lock_addr);
close(socket->fd_lock);
socket->fd_lock = -1;
return -1;
goto err_fd;
}
if (stat(socket->addr.sun_path, &socket_stat) < 0 ) {
if (errno != ENOENT) {
wl_log("did not manage to stat file %s\n",
socket->addr.sun_path);
close(socket->fd_lock);
socket->fd_lock = -1;
return -1;
goto err_fd;
}
} else if (socket_stat.st_mode & S_IWUSR ||
socket_stat.st_mode & S_IWGRP) {
@ -1060,6 +1056,18 @@ wl_socket_lock(struct wl_socket *socket)
}
return 0;
err_fd:
close(socket->fd_lock);
socket->fd_lock = -1;
err:
*socket->lock_addr = 0;
/* we did not set this value here, but without lock the
* socket won't be created anyway. This prevents the
* wl_socket_destroy from unlinking already existing socket
* created by other compositor */
*socket->addr.sun_path = 0;
return -1;
}
static int
@ -1088,6 +1096,7 @@ wl_socket_init_for_display_name(struct wl_socket *s, const char *name)
if (name_size > (int)sizeof s->addr.sun_path) {
wl_log("error: socket path \"%s/%s\" plus null terminator"
" exceeds 108 bytes\n", runtime_dir, name);
*s->addr.sun_path = 0;
/* to prevent programs reporting
* "failed to add socket: Success" */
errno = ENAMETOOLONG;