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xnest: fix segfault in miCreateScreenResources() 

With aa3f5023e3, pScreen->devPrivate now is
initialized only once, which uncovered a silent bug in xnestOpenScreen:
It's NULL'ing the pScreen->devPrivate pointer which already had been
initialized by previous miScreenDevPrivateInit() call.

Fixes: aa3f5023e3
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1495>
This commit is contained in:
Enrico Weigelt, metux IT consult 2024-04-18 18:51:36 +02:00 committed by Marge Bot
parent 86d0f6dafa
commit 94451181c2
3 changed files with 26 additions and 2 deletions
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5
hw/xnest/Screen.c
View File

@ -20,6 +20,8 @@ is" without express or implied warranty.
#include <X11/Xdefs.h>
#include <X11/Xproto.h>
#include "mi/mi_priv.h"
#include "scrnintstr.h"
#include "dix.h"
#include "mi.h"
@ -257,7 +259,6 @@ xnestOpenScreen(ScreenPtr pScreen, int argc, char *argv[])
pScreen->blackPixel = xnestBlackPixel;
/* GCperDepth */
/* defaultStipple */
pScreen->devPrivate = NULL;
/* WindowPrivateLen */
/* WindowPrivateSizes */
/* totalWindowSize */
@ -419,7 +420,7 @@ xnestCloseScreen(ScreenPtr pScreen)
free(pScreen->allowedDepths[i].vids);
free(pScreen->allowedDepths);
free(pScreen->visuals);
free(pScreen->devPrivate);
miScreenClose(pScreen);
/*
If xnestDoFullGeneration all x resources will be destroyed upon closing

12
mi/mi_priv.h Normal file
View File

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: MIT OR X11
*
* Copyright © 2024 Enrico Weigelt, metux IT consult <info@metux.net>
*/
#ifndef _XSERVER_MI_PRIV_H
#define _XSERVER_MI_PRIV_H
#include "screenint.h"
void miScreenClose(ScreenPtr pScreen);
#endif /* _XSERVER_MI_PRIV_H */

11
mi/miscrinit.c
View File

@ -31,6 +31,9 @@ from The Open Group.
#endif
#include <X11/X.h>
#include "mi/mi_priv.h"
#include "servermd.h"
#include "misc.h"
#include "mi.h"
@ -309,3 +312,11 @@ miSetZeroLineBias(ScreenPtr pScreen, unsigned int bias)
dixSetPrivate(&pScreen->devPrivates, miZeroLineScreenKey,
(unsigned long *) (unsigned long) bias);
}
void miScreenClose(ScreenPtr pScreen)
{
if (pScreen->devPrivate) {
free(pScreen->devPrivate);
pScreen->devPrivate = NULL;
}
}