mirrors/reactos
0
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-11-27 05:23:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

[NTGDI] Prevent NULL pointer dereference in CLIPPING_UpdateGCRegion

Browse Source 
This can happen, when the paged pool is full. This will probably cause drawing issues, but at least we don't crash (in this place).
This commit is contained in:
Timo Kreuzer 2024-09-05 13:17:18 +03:00
parent 299e4305ef
commit 9414fb6b59
1 changed files with 20 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
win32ss/gdi/ntgdi/cliprgn.c
View File

@ -11,6 +11,8 @@
#define NDEBUG #define NDEBUG
#include <debug.h> #include <debug.h>
DBG_DEFAULT_CHANNEL(GdiClipRgn);
VOID VOID
FASTCALL FASTCALL
IntGdiReleaseRaoRgn(PDC pDC) IntGdiReleaseRaoRgn(PDC pDC)
@ -776,16 +778,16 @@ CLIPPING_UpdateGCRegion(PDC pDC)
pDC->prgnAPI = NULL; pDC->prgnAPI = NULL;
} }
if (pDC->prgnRao)
REGION_Delete(pDC->prgnRao);
pDC->prgnRao = IntSysCreateRectpRgn(0,0,0,0);
ASSERT(pDC->prgnRao);
if (pDC->dclevel.prgnMeta || pDC->dclevel.prgnClip) if (pDC->dclevel.prgnMeta || pDC->dclevel.prgnClip)
{ {
pDC->prgnAPI = IntSysCreateRectpRgn(0,0,0,0); pDC->prgnAPI = IntSysCreateRectpRgn(0,0,0,0);
if (!pDC->prgnAPI)
{
/* Best we can do here. Better than crashing. */
ERR("Failed to allocate prgnAPI! Expect drawing issues!\n");
return;
}
if (!pDC->dclevel.prgnMeta) if (!pDC->dclevel.prgnMeta)
{ {
REGION_bCopy(pDC->prgnAPI, REGION_bCopy(pDC->prgnAPI,
@ -804,6 +806,17 @@ CLIPPING_UpdateGCRegion(PDC pDC)
} }
} }
if (pDC->prgnRao)
REGION_Delete(pDC->prgnRao);
pDC->prgnRao = IntSysCreateRectpRgn(0,0,0,0);
if (!pDC->prgnRao)
{
/* Best we can do here. Better than crashing. */
ERR("Failed to allocate prgnRao! Expect drawing issues!\n");
return;
}
if (pDC->prgnAPI) if (pDC->prgnAPI)
{ {
REGION_bIntersectRegion(pDC->prgnRao, REGION_bIntersectRegion(pDC->prgnRao,