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Xext: shape: fix warning on possible NULL dereference 

Try not to rely on deep black magic of calloc(), instead skip the whole
part of nrects is zero.

| ../Xext/shape.c: In function ‘ProcShapeGetRectangles’:
| ../Xext/shape.c:995:24: warning: dereference of possibly-NULL ‘rects’ [CWE-690] [-Wanalyzer-possible-null-dereference]
|   995 |             rects[i].x = box->x1;
|       |             ~~~~~~~~~~~^~~~~~~~~

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2025-05-06 16:56:51 +02:00
parent 7a6d2d41bd
commit c4642f2632
1 changed files with 11 additions and 9 deletions
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8
Xext/shape.c
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@ -938,7 +938,7 @@ ProcShapeGetRectangles(ClientPtr client)
REQUEST(xShapeGetRectanglesReq);
WindowPtr pWin;
xShapeGetRectanglesReply rep;
xRectangle *rects;
xRectangle *rects = NULL;
int nrects, i, rc;
RegionPtr region;
@ -991,8 +991,9 @@ ProcShapeGetRectangles(ClientPtr client)
nrects = RegionNumRects(region);
box = RegionRects(region);
rects = xallocarray(nrects, sizeof(xRectangle));
if (!rects && nrects)
if (nrects) {
rects = calloc(nrects, sizeof(xRectangle));
if (!rects)
return BadAlloc;
for (i = 0; i < nrects; i++, box++) {
rects[i].x = box->x1;
@ -1001,6 +1002,7 @@ ProcShapeGetRectangles(ClientPtr client)
rects[i].height = box->y2 - box->y1;
}
}
}
rep = (xShapeGetRectanglesReply) {
.type = X_Reply,
.ordering = YXBanded,