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Fix OOB when the number of screens change

This commit is contained in:
Yuxuan Shui 2018-10-22 15:38:45 +01:00
parent a47f112833
commit db700f9be1
1 changed files with 7 additions and 1 deletions
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8
src/compton.c
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@ -1778,7 +1778,13 @@ paint_all(session_t *ps, region_t *region, const region_t *region_real, win * co
pixman_region32_subtract(&reg_tmp, &reg_tmp, &bshape); pixman_region32_subtract(&reg_tmp, &reg_tmp, &bshape);
#ifdef CONFIG_XINERAMA #ifdef CONFIG_XINERAMA
if (ps->o.xinerama_shadow_crop && w->xinerama_scr >= 0) if (ps->o.xinerama_shadow_crop && w->xinerama_scr >= 0 &&
w->xinerama_scr < ps->xinerama_nscrs)
// There can be a window where number of screens is updated,
// but the screen number attached to the windows have not.
//
// Window screen number will be updated eventually, so here we
// just check to make sure we don't access out of bounds.
pixman_region32_intersect(&reg_tmp, &reg_tmp, pixman_region32_intersect(&reg_tmp, &reg_tmp,
&ps->xinerama_scr_regs[w->xinerama_scr]); &ps->xinerama_scr_regs[w->xinerama_scr]);
#endif #endif