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Fix crash caused by race when reading _NET_CURRENT_DESKTOP and _NET_NUMBER_OF_DESKTOPS

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This commit is contained in:
o9000 2016-01-26 20:30:31 +01:00
parent f0de284dd9
commit 402713d4b1
1 changed files with 8 additions and 4 deletions
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12
src/server.c
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@ -427,8 +427,10 @@ void server_get_number_of_desktops()
XFree(x_screen_size);
int num_viewports = MAX(x_screen_width / work_area_width, 1) * MAX(x_screen_height / work_area_height, 1);
if (num_viewports <= 1)
if (num_viewports <= 1) {
server.num_desktops = 1;
return;
}
server.viewports = calloc(num_viewports, sizeof(Viewport));
int k = 0;
@ -473,8 +475,9 @@ GSList *get_desktop_names()
int get_current_desktop()
{
if (!server.viewports)
return get_property32(server.root_win, server.atom._NET_CURRENT_DESKTOP, XA_CARDINAL);
if (!server.viewports) {
return MAX(0, MIN(server.num_desktops - 1, get_property32(server.root_win, server.atom._NET_CURRENT_DESKTOP, XA_CARDINAL)));
}
int num_results;
long *work_area_size = server_get_property(server.root_win, server.atom._NET_WORKAREA, XA_CARDINAL, &num_results);
@ -507,7 +510,8 @@ int get_current_desktop()
// fprintf(stderr, "Viewport pos: %d x %d\n", viewport_x, viewport_y);
// fprintf(stderr, "Viewport i: %d\n", (viewport_y / work_area_height) * ncols + viewport_x / work_area_width);
return (viewport_y / work_area_height) * ncols + viewport_x / work_area_width;
int result = (viewport_y / work_area_height) * ncols + viewport_x / work_area_width;
return MAX(0, MIN(server.num_desktops - 1, result));
}
void change_desktop(int desktop)