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composite: silence some warnings on possible NULL dereference 

Unlikely to practically happen, but still safer to just check for sure.
A simple zero-value test doesn't cost us much (on modern CPUs perhaps
not even a full clock cycle).

| ../composite/compalloc.c: In function ‘compRedirectWindow’:
| ../composite/compalloc.c:167:35: warning: dereference of NULL ‘pClient’ [CWE-476] [-Wanalyzer-null-dereference]
|   167 |     ccw->id = FakeClientID(pClient->index);
|       |                            ~~~~~~~^~~~~~~

| ../composite/compalloc.c: In function ‘compUnredirectWindow’:
| ../composite/compalloc.c:331:75: warning: dereference of NULL ‘pClient’ [CWE-476] [-Wanalyzer-null-dereference]
|   331 |         if (ccw->update == update && dixClientIdForXID(ccw->id) == pClient->index) {
|       |                                                                    ~~~~~~~^~~~~~~

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2025-05-06 16:06:55 +02:00
parent 10e9f99fb2
commit 1e2842f3e5
1 changed files with 6 additions and 0 deletions
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6
composite/compalloc.c
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@ -43,6 +43,8 @@
#include <dix-config.h>
#include "os/bug_priv.h"
#include "compint.h"
static Bool
@ -133,6 +135,8 @@ compHandleMarkedWindows(WindowPtr pWin, WindowPtr pLayerWin)
int
compRedirectWindow(ClientPtr pClient, WindowPtr pWin, int update)
{
BUG_RETURN_VAL(!pClient, BadMatch);
CompWindowPtr cw = GetCompWindow(pWin);
CompClientWindowPtr ccw;
CompScreenPtr cs = GetCompScreen(pWin->drawable.pScreen);
@ -323,6 +327,8 @@ compUnredirectWindow(ClientPtr pClient, WindowPtr pWin, int update)
CompWindowPtr cw = GetCompWindow(pWin);
CompClientWindowPtr ccw;
BUG_RETURN_VAL(!pClient, BadValue);
if (!cw)
return BadValue;