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[client] x11: check for null data from XGetWindowProperty

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This fixes a reported segfault when a window manager fails to provide
valid EWMH values.

Fixes #987
This commit is contained in:
Geoffrey McRae 2022-05-15 16:38:17 +10:00
parent 32fbcaffd2
commit 3b55ac5420
1 changed files with 4 additions and 4 deletions
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8
client/displayservers/X11/x11.c
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@ -190,14 +190,14 @@ static void x11CheckEWMHSupport(void)
if (XGetWindowProperty(x11.display, DefaultRootWindow(x11.display),
x11atoms._NET_SUPPORTING_WM_CHECK, 0, ~0L, False, XA_WINDOW,
&type, &fmt, &num, &bytes, &data) != Success)
&type, &fmt, &num, &bytes, &data) != Success || !data)
goto out;
Window * windowFromRoot = (Window *)data;
if (XGetWindowProperty(x11.display, *windowFromRoot,
x11atoms._NET_SUPPORTING_WM_CHECK, 0, ~0L, False, XA_WINDOW,
&type, &fmt, &num, &bytes, &data) != Success)
&type, &fmt, &num, &bytes, &data) != Success || !data)
goto out_root;
Window * windowFromChild = (Window *)data;
@ -206,7 +206,7 @@ static void x11CheckEWMHSupport(void)
if (XGetWindowProperty(x11.display, DefaultRootWindow(x11.display),
x11atoms._NET_SUPPORTED, 0, ~0L, False, AnyPropertyType,
&type, &fmt, &num, &bytes, &data) != Success)
&type, &fmt, &num, &bytes, &data) != Success || !data)
goto out_child;
Atom * supported = (Atom *)data;
@ -214,7 +214,7 @@ static void x11CheckEWMHSupport(void)
if (XGetWindowProperty(x11.display, *windowFromRoot,
x11atoms._NET_WM_NAME, 0, ~0L, False, AnyPropertyType,
&type, &fmt, &num, &bytes, &data) != Success)
&type, &fmt, &num, &bytes, &data) != Success || !data)
goto out_supported;
char * wmName = (char *)data;