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dix: touch: NULL-protection in TouchAddRegularListener() 

protect against the (unlikely) case that inputMasks == NULL.

| ../dix/touch.c: In function ‘TouchAddRegularListener’:
| ../include/list.h:376:21: warning: dereference of NULL ‘0’ [CWE-476] [-Wanalyzer-null-dereference]
|   376 |         for (_entry = _list; _entry; _entry = (_entry)->_member)
| ../dix/touch.c:766:9: note: in expansion of macro ‘nt_list_for_each_entry’
|   766 |         nt_list_for_each_entry(iclients, inputMasks->inputClients, next) {
|       |         ^~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2025-05-06 14:16:29 +02:00
parent 076bc54064
commit 654c9c1f3d
1 changed files with 2 additions and 2 deletions
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4
dix/touch.c
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@ -760,7 +760,7 @@ TouchAddRegularListener(DeviceIntPtr dev, TouchPointInfoPtr ti,
inputMasks = wOtherInputMasks(win); inputMasks = wOtherInputMasks(win);
if (mask & EVENT_XI2_MASK) { if ((mask & EVENT_XI2_MASK) && (inputMasks != NULL)) {
nt_list_for_each_entry(iclients, inputMasks->inputClients, next) { nt_list_for_each_entry(iclients, inputMasks->inputClients, next) {
if (!xi2mask_isset(iclients->xi2mask, dev, evtype)) if (!xi2mask_isset(iclients->xi2mask, dev, evtype))
continue; continue;
@ -774,7 +774,7 @@ TouchAddRegularListener(DeviceIntPtr dev, TouchPointInfoPtr ti,
} }
} }
if (mask & EVENT_XI1_MASK) { if ((mask & EVENT_XI1_MASK) && (inputMasks != NULL)) {
int xitype = GetXIType(TouchGetPointerEventType(ev)); int xitype = GetXIType(TouchGetPointerEventType(ev));
Mask xi_filter = event_get_filter_from_type(dev, xitype); Mask xi_filter = event_get_filter_from_type(dev, xitype);