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xwm: Add and use helper function for looking up windows in the hash table

Browse source 
This lets us verify that all callers are actually testing for a
successful hash lookup at compile time.

All current users of hash_table_lookup are converted to the new
wm_lookup_window() and the appropriate success check is added.
This fixes any call sites that used to assume a successful return
and dereference a NULL pointer.

This closes http://bugs.freedesktop.org/show_bug.cgi?id=83994
The xwayland test has been failing because weston crashes due to
a hash lookup failure and a subsequent dereference of the returned
NULL pointer.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Derek Foreman 2015-04-09 10:51:22 -05:00 committed by Pekka Paalanen
parent 46804ca5dd
commit 4937214999
1 changed files with 37 additions and 22 deletions
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59
xwayland/window-manager.c
View file

@ -195,6 +195,15 @@ wm_log_continue(const char *fmt, ...)
#endif
}
static bool __attribute__ ((warn_unused_result))
wm_lookup_window(struct weston_wm *wm, xcb_window_t hash,
struct weston_wm_window **window)
{
*window = hash_table_lookup(wm->window_hash, hash);
if (*window)
return true;
return false;
}
const char *
get_atom_name(xcb_connection_t *c, xcb_atom_t atom)
@ -448,8 +457,9 @@ weston_wm_window_read_properties(struct weston_wm_window *window)
break;
case XCB_ATOM_WINDOW:
xid = xcb_get_property_value(reply);
*(struct weston_wm_window **) p =
hash_table_lookup(wm->window_hash, *xid);
if (!wm_lookup_window(wm, *xid, p))
weston_log("XCB_ATOM_WINDOW contains window"
" id not found in hash table.\n");
break;
case XCB_ATOM_CARDINAL:
case XCB_ATOM_ATOM:
@ -594,7 +604,8 @@ weston_wm_handle_configure_request(struct weston_wm *wm, xcb_generic_event_t *ev
configure_request->x, configure_request->y,
configure_request->width, configure_request->height);
window = hash_table_lookup(wm->window_hash, configure_request->window);
if (!wm_lookup_window(wm, configure_request->window, &window))
return;
if (window->fullscreen) {
weston_wm_window_send_configure_notify(window);
@ -660,7 +671,9 @@ weston_wm_handle_configure_notify(struct weston_wm *wm, xcb_generic_event_t *eve
configure_notify->x, configure_notify->y,
configure_notify->width, configure_notify->height);
window = hash_table_lookup(wm->window_hash, configure_notify->window);
if (!wm_lookup_window(wm, configure_notify->window, &window))
return;
window->x = configure_notify->x;
window->y = configure_notify->y;
if (window->override_redirect) {
@ -932,7 +945,8 @@ weston_wm_handle_map_request(struct weston_wm *wm, xcb_generic_event_t *event)
return;
}
window = hash_table_lookup(wm->window_hash, map_request->window);
if (!wm_lookup_window(wm, map_request->window, &window))
return;
weston_wm_window_read_properties(window);
@ -984,7 +998,9 @@ weston_wm_handle_unmap_notify(struct weston_wm *wm, xcb_generic_event_t *event)
* as it may come in after we've destroyed the window. */
return;
window = hash_table_lookup(wm->window_hash, unmap_notify->window);
if (!wm_lookup_window(wm, unmap_notify->window, &window))
return;
if (wm->focus_window == window)
wm->focus_window = NULL;
if (window->surface)
@ -1113,8 +1129,7 @@ weston_wm_handle_property_notify(struct weston_wm *wm, xcb_generic_event_t *even
(xcb_property_notify_event_t *) event;
struct weston_wm_window *window;
window = hash_table_lookup(wm->window_hash, property_notify->window);
if (!window)
if (!wm_lookup_window(wm, property_notify->window, &window))
return;
window->properties_dirty = 1;
@ -1232,7 +1247,9 @@ weston_wm_handle_destroy_notify(struct weston_wm *wm, xcb_generic_event_t *event
if (our_resource(wm, destroy_notify->window))
return;
window = hash_table_lookup(wm->window_hash, destroy_notify->window);
if (!wm_lookup_window(wm, destroy_notify->window, &window))
return;
weston_wm_window_destroy(window);
}
@ -1253,8 +1270,8 @@ weston_wm_handle_reparent_notify(struct weston_wm *wm, xcb_generic_event_t *even
reparent_notify->x, reparent_notify->y,
reparent_notify->override_redirect);
} else if (!our_resource(wm, reparent_notify->parent)) {
window = hash_table_lookup(wm->window_hash,
reparent_notify->window);
if (!wm_lookup_window(wm, reparent_notify->window, &window))
return;
weston_wm_window_destroy(window);
}
}
@ -1492,8 +1509,6 @@ weston_wm_handle_client_message(struct weston_wm *wm,
(xcb_client_message_event_t *) event;
struct weston_wm_window *window;
window = hash_table_lookup(wm->window_hash, client_message->window);
wm_log("XCB_CLIENT_MESSAGE (%s %d %d %d %d %d win %d)\n",
get_atom_name(wm->conn, client_message->type),
client_message->data.data32[0],
@ -1506,7 +1521,7 @@ weston_wm_handle_client_message(struct weston_wm *wm,
/* The window may get created and destroyed before we actually
* handle the message. If it doesn't exist, bail.
*/
if (!window)
if (!wm_lookup_window(wm, client_message->window, &window))
return;
if (client_message->type == wm->atom.net_wm_moveresize)
@ -1722,8 +1737,8 @@ weston_wm_handle_button(struct weston_wm *wm, xcb_generic_event_t *event)
button->response_type == XCB_BUTTON_PRESS ?
"PRESS" : "RELEASE", button->detail);
window = hash_table_lookup(wm->window_hash, button->event);
if (!window || !window->decorate)
if (!wm_lookup_window(wm, button->event, &window) ||
!window->decorate)
return;
if (button->detail != 1 && button->detail != 2)
@ -1786,8 +1801,8 @@ weston_wm_handle_motion(struct weston_wm *wm, xcb_generic_event_t *event)
enum theme_location location;
int cursor;
window = hash_table_lookup(wm->window_hash, motion->event);
if (!window || !window->decorate)
if (!wm_lookup_window(wm, motion->event, &window) ||
!window->decorate)
return;
location = frame_pointer_motion(window->frame, NULL,
@ -1807,8 +1822,8 @@ weston_wm_handle_enter(struct weston_wm *wm, xcb_generic_event_t *event)
enum theme_location location;
int cursor;
window = hash_table_lookup(wm->window_hash, enter->event);
if (!window || !window->decorate)
if (!wm_lookup_window(wm, enter->event, &window) ||
!window->decorate)
return;
location = frame_pointer_enter(window->frame, NULL,
@ -1826,8 +1841,8 @@ weston_wm_handle_leave(struct weston_wm *wm, xcb_generic_event_t *event)
xcb_leave_notify_event_t *leave = (xcb_leave_notify_event_t *) event;
struct weston_wm_window *window;
window = hash_table_lookup(wm->window_hash, leave->event);
if (!window || !window->decorate)
if (!wm_lookup_window(wm, leave->event, &window) ||
!window->decorate)
return;
frame_pointer_leave(window->frame, NULL);