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Never allocate 0 bytes. Fixes bug 1082.

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svn path=/trunk/; revision=20010
This commit is contained in:
Gé van Geldorp 2005-12-09 17:56:26 +00:00
parent 188a82d7eb
commit d224b2b02f
1 changed files with 6 additions and 2 deletions
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8
reactos/subsys/win32k/objects/region.c
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@ -405,7 +405,11 @@ typedef struct _ScanLineListBlock {
static __inline int xmemcheck(ROSRGNDATA *reg, PRECT *rect, PRECT *firstrect ) { static __inline int xmemcheck(ROSRGNDATA *reg, PRECT *rect, PRECT *firstrect ) {
if ( (reg->rdh.nCount+1)*sizeof( RECT ) >= reg->rdh.nRgnSize ) { if ( (reg->rdh.nCount+1)*sizeof( RECT ) >= reg->rdh.nRgnSize ) {
PRECT temp; PRECT temp;
temp = ExAllocatePoolWithTag( PagedPool, (2 * (reg->rdh.nRgnSize)), TAG_REGION); DWORD NewSize = 2 * reg->rdh.nRgnSize;
if (NewSize < (reg->rdh.nCount + 1) * sizeof(RECT)) {
NewSize = (reg->rdh.nCount + 1) * sizeof(RECT);
}
temp = ExAllocatePoolWithTag( PagedPool, NewSize, TAG_REGION);
if (temp == 0) if (temp == 0)
return 0; return 0;
@ -413,7 +417,7 @@ static __inline int xmemcheck(ROSRGNDATA *reg, PRECT *rect, PRECT *firstrect ) {
/* copy the rectangles */ /* copy the rectangles */
COPY_RECTS(temp, *firstrect, reg->rdh.nCount); COPY_RECTS(temp, *firstrect, reg->rdh.nCount);
reg->rdh.nRgnSize *= 2; reg->rdh.nRgnSize = NewSize;
if (*firstrect != &reg->rdh.rcBound) if (*firstrect != &reg->rdh.rcBound)
ExFreePool( *firstrect ); ExFreePool( *firstrect );
*firstrect = temp; *firstrect = temp;