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Merge pull request #924 from zandrmartin/fix-focus-segfault

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prevent dereference of freed workspace
This commit is contained in:
Drew DeVault 2016-10-03 08:10:29 -04:00 committed by GitHub
commit d2aba3ce3a
1 changed files with 31 additions and 16 deletions
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47
sway/focus.c
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@ -1,3 +1,4 @@
#include "stdbool.h"
#include <wlc/wlc.h>
#include "sway/focus.h"
#include "sway/workspace.h"
@ -99,14 +100,24 @@ bool set_focused_container(swayc_t *c) {
if (locked_container_focus || !c || !c->parent) {
return false;
}
swayc_t *active_ws = swayc_active_workspace();
int active_ws_child_count = 0;
if (active_ws) {
active_ws_child_count = active_ws->children->length + active_ws->floating->length;
// current ("old") workspace for sending workspace change event later
swayc_t *old_ws = swayc_active_workspace();
// keep track of child count so we can determine if it gets destroyed
int old_ws_child_count = 0;
if (old_ws) {
old_ws_child_count = old_ws->children->length + old_ws->floating->length;
}
// current ("old") focused container
swayc_t *old_focus = get_focused_container(&root_container);
// if old_focus is a workspace, then it's the same workspace as
// old_ws, and we'll need to null its pointer too, since it will
// be destroyed in the update_focus() call
bool old_focus_was_ws = (old_focus->type == C_WORKSPACE);
// workspace of new focused container
swayc_t *workspace = swayc_active_workspace_for(c);
swayc_t *focused = get_focused_container(&root_container);
if (swayc_is_fullscreen(get_focused_container(workspace))) {
// if switching to a workspace with a fullscreen view,
@ -136,11 +147,19 @@ bool set_focused_container(swayc_t *c) {
p->is_focused = false;
}
if (old_focus_was_ws && old_ws_child_count == 0) {
// this workspace was destroyed in update_focus(), so null the pointers
old_focus = NULL;
old_ws = NULL;
}
if (!(wlc_view_get_type(p->handle) & WLC_BIT_POPUP)) {
if (focused->type == C_VIEW) {
wlc_view_set_state(focused->handle, WLC_BIT_ACTIVATED, false);
if (old_focus) {
if (old_focus->type == C_VIEW) {
wlc_view_set_state(old_focus->handle, WLC_BIT_ACTIVATED, false);
}
update_container_border(old_focus);
}
update_container_border(focused);
if (c->type == C_VIEW) {
wlc_view_set_state(c->handle, WLC_BIT_ACTIVATED, true);
}
@ -161,15 +180,11 @@ bool set_focused_container(swayc_t *c) {
}
}
if (active_ws != workspace) {
// active_ws might have been destroyed by now
// (focus swap away from empty ws = destroy ws)
if (active_ws_child_count == 0) {
active_ws = NULL;
}
ipc_event_workspace(active_ws, workspace, "focus");
if (old_ws != workspace) {
// old_ws might be NULL here but that's ok
ipc_event_workspace(old_ws, workspace, "focus");
}
return true;
}