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xwayland/xwm: add prop count assert in xsurface_set_net_wm_state

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This helps mitigate buffer overflows.
This commit is contained in:
Simon Ser 2020-07-21 13:15:00 +02:00 committed by Drew DeVault
parent cd4827b3b6
commit 13f35139d3
1 changed files with 3 additions and 3 deletions
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6
xwayland/xwm.c
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@ -294,10 +294,9 @@ static void xwm_surface_activate(struct wlr_xwm *xwm,
static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface) { static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface) {
struct wlr_xwm *xwm = xsurface->xwm; struct wlr_xwm *xwm = xsurface->xwm;
uint32_t property[5];
int i;
i = 0; uint32_t property[5];
size_t i = 0;
if (xsurface->modal) { if (xsurface->modal) {
property[i++] = xwm->atoms[NET_WM_STATE_MODAL]; property[i++] = xwm->atoms[NET_WM_STATE_MODAL];
} }
@ -313,6 +312,7 @@ static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface) {
if (xsurface->minimized) { if (xsurface->minimized) {
property[i++] = xwm->atoms[NET_WM_STATE_HIDDEN]; property[i++] = xwm->atoms[NET_WM_STATE_HIDDEN];
} }
assert(i <= sizeof(property) / sizeof(property[0]));
xcb_change_property(xwm->xcb_conn, xcb_change_property(xwm->xcb_conn,
XCB_PROP_MODE_REPLACE, XCB_PROP_MODE_REPLACE,