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Bug fix: Double free when XQueryTree() fails 

Take care of failure of XQueryTree() to prevent it from causing a
double-free crash. This usually happens when X is initializing and windows
are constantly changing.
This commit is contained in:
Richard Grenville 2012-09-12 12:14:24 +08:00
parent 35f7d45130
commit 6f079af2f0
1 changed files with 24 additions and 6 deletions
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30
src/compton.c
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@ -1022,7 +1022,7 @@ paint_all(Display *dpy, XserverRegion region) {
}
#ifdef DEBUG_REPAINT
printf(" 0x%x", w->id);
printf(" %#010lx", w->id);
#endif
if (clip_changed) {
@ -1418,8 +1418,17 @@ map_win(Display *dpy, Window id,
Window *tchildren;
unsigned tnchildren;
XQueryTree(dpy, wid, &troot, &parent, &tchildren, &tnchildren);
XFree(tchildren);
// XQueryTree probably fails if you run compton when X is somehow
// initializing (like add it in .xinitrc). In this case
// just leave it alone.
if(!XQueryTree(dpy, wid, &troot, &parent, &tchildren,
&tnchildren)) {
wid = 0;
break;
}
if (tchildren)
XFree(tchildren);
wid = parent;
}
@ -2934,11 +2943,20 @@ main(int argc, char **argv) {
&& !array_wid_exists(children, nchildren, wid)) {
Window troot;
Window parent;
Window *tchildren;
Window *tchildren = 0;
unsigned tnchildren;
XQueryTree(dpy, wid, &troot, &parent, &tchildren, &tnchildren);
XFree(tchildren);
// XQueryTree probably fails if you run compton when X is somehow
// initializing (like add it in .xinitrc). In this case
// just leave it alone.
if(!XQueryTree(dpy, wid, &troot, &parent, &tchildren,
&tnchildren)) {
wid = 0;
break;
}
if (tchildren)
XFree(tchildren);
wid = parent;
}