Avoid calling xalloc(0). Change rrScreenSizeSet to rrScreenSetSize.

randr/randr.c

@@ -198,7 +198,7 @@ Bool RRScreenInit(ScreenPtr pScreen)
     pScrPriv->maxHeight = pScrPriv->minHeight = pScreen->height;
     
 #if RANDR_12_INTERFACE
-    pScrPriv->rrScreenSizeSet = NULL;
+    pScrPriv->rrScreenSetSize = NULL;
     pScrPriv->rrCrtcSet = NULL;
     pScrPriv->rrCrtcSetGamma = NULL;
 #endif

randr/randrstr.h

@@ -174,7 +174,7 @@ typedef struct _rrScrPriv {
 #endif
     RRGetInfoProcPtr	    rrGetInfo;
 #if RANDR_12_INTERFACE
-    RRScreenSetSizeProcPtr  rrScreenSizeSet;
+    RRScreenSetSizeProcPtr  rrScreenSetSize;
     RRCrtcSetProcPtr	    rrCrtcSet;
     RRCrtcSetGammaProcPtr   rrCrtcSetGamma;
 #endif
@@ -521,7 +521,7 @@ RRClientKnowsRates (ClientPtr	pClient);
 RRModePtr
 RRModeGet (ScreenPtr	pScreen,
 	   xRRModeInfo	*modeInfo,
-	   char		*name);
+	   const char	*name);
 
 /*
  * Destroy a mode.
@@ -555,7 +555,7 @@ ProcRRDeleteOutputMode (ClientPtr client);
 
 RROutputPtr
 RROutputCreate (ScreenPtr   pScreen,
-		char	    *name,
+		const char  *name,
 		int	    nameLength,
 		void	    *devPrivate);
 

randr/rrcrtc.c

@@ -94,6 +94,8 @@ RRCrtcNotify (RRCrtcPtr	    crtc,
     {
 	RROutputPtr *outputs;
 	
+	if (numOutputs)
+	{
 	    if (crtc->numOutputs)
 		outputs = xrealloc (crtc->outputs,
 				    numOutputs * sizeof (RROutputPtr));
@@ -101,6 +103,13 @@ RRCrtcNotify (RRCrtcPtr	    crtc,
 		outputs = xalloc (numOutputs * sizeof (RROutputPtr));
 	    if (!outputs)
 		return FALSE;
+	}
+	else
+	{
+	    if (crtc->outputs)
+		xfree (crtc->outputs);
+	    outputs = NULL;
+	}
 	crtc->outputs = outputs;
     }
     for (i = 0; i < numOutputs; i++)
@@ -300,9 +309,14 @@ RRCrtcGammaSetSize (RRCrtcPtr	crtc,
 
     if (size == crtc->gammaSize)
 	return TRUE;
+    if (size)
+    {
 	gamma = xalloc (size * 3 * sizeof (CARD16));
 	if (!gamma)
 	    return FALSE;
+    }
+    else
+	gamma = NULL;
     if (crtc->gammaRed)
 	xfree (crtc->gammaRed);
     crtc->gammaRed = gamma;
@@ -376,9 +390,14 @@ ProcRRGetCrtcInfo (ClientPtr client)
     rep.length = rep.nOutput + rep.nPossibleOutput;
 
     extraLen = rep.length << 2;
+    if (extraLen)
+    {
 	extra = xalloc (extraLen);
 	if (!extra)
 	    return BadAlloc;
+    }
+    else
+	extra = NULL;
 
     outputs = (RROutput *) extra;
     possible = (RROutput *) (outputs + rep.nOutput);
@@ -467,9 +486,14 @@ ProcRRSetCrtcConfig (ClientPtr client)
 	if (numOutputs == 0)
 	    return BadMatch;
     }
+    if (numOutputs)
+    {
 	outputs = xalloc (numOutputs * sizeof (RROutputPtr));
 	if (!outputs)
 	    return BadAlloc;
+    }
+    else
+	outputs = NULL;
     
     outputIds = (RROutput *) (stuff + 1);
     for (i = 0; i < numOutputs; i++)
@@ -574,7 +598,7 @@ ProcRRSetCrtcConfig (ClientPtr client)
      * for setting screen size. Else, assume the CrtcSet sets
      * the size along with the mode
      */
-    if (pScrPriv->rrScreenSizeSet)
+    if (pScrPriv->rrScreenSetSize)
     {
 	if (stuff->x + mode->mode.width > pScreen->width)
 	{

randr/rrmode.c

@@ -27,7 +27,7 @@ RESTYPE	RRModeType;
 RRModePtr
 RRModeGet (ScreenPtr	pScreen,
 	   xRRModeInfo	*modeInfo,
-	   char		*name)
+	   const char	*name)
 {
     rrScrPriv (pScreen);
     int	i;

randr/rroutput.c

@@ -30,7 +30,7 @@ RESTYPE	RROutputType;
 
 RROutputPtr
 RROutputCreate (ScreenPtr   pScreen,
-		char	    *name,
+		const char  *name,
 		int	    nameLength,
 		void	    *devPrivate)
 {
@@ -89,9 +89,14 @@ RROutputSetClones (RROutputPtr  output,
 {
     RROutputPtr	*newClones;
 
+    if (numClones)
+    {
 	newClones = xalloc (numClones * sizeof (RROutputPtr));
 	if (!newClones)
 	    return FALSE;
+    }
+    else
+	newClones = NULL;
     if (output->clones)
 	xfree (output->clones);
     memcpy (newClones, clones, numClones * sizeof (RROutputPtr));
@@ -108,9 +113,14 @@ RROutputSetModes (RROutputPtr	output,
 {
     RRModePtr	*newModes;
 
+    if (numModes)
+    {
 	newModes = xalloc (numModes * sizeof (RRModePtr));
 	if (!newModes)
 	    return FALSE;
+    }
+    else
+	newModes = NULL;
     if (output->modes)
 	xfree (output->modes);
     memcpy (newModes, modes, numModes * sizeof (RRModePtr));
@@ -127,9 +137,14 @@ RROutputSetCrtcs (RROutputPtr	output,
 {
     RRCrtcPtr	*newCrtcs;
 
+    if (numCrtcs)
+    {
 	newCrtcs = xalloc (numCrtcs * sizeof (RRCrtcPtr));
 	if (!newCrtcs)
 	    return FALSE;
+    }
+    else
+	newCrtcs = NULL;
     if (output->crtcs)
 	xfree (output->crtcs);
     memcpy (newCrtcs, crtcs, numCrtcs * sizeof (RRCrtcPtr));
@@ -265,9 +280,14 @@ ProcRRGetOutputInfo (ClientPtr client)
 		  ((rep.nameLength + 3) >> 2));
 
     extraLen = rep.length << 2;
+    if (extraLen)
+    {
 	extra = xalloc (extraLen);
 	if (!extra)
 	    return BadAlloc;
+    }
+    else
+	extra = NULL;
 
     crtcs = (RRCrtc *) extra;
     modes = (RRMode *) (crtcs + output->numCrtcs);

randr/rrscreen.c

@@ -187,9 +187,9 @@ RRScreenSizeSet (ScreenPtr  pScreen,
     rrScrPriv(pScreen);
 
 #if RANDR_12_INTERFACE
-    if (pScrPriv->rrScreenSizeSet)
+    if (pScrPriv->rrScreenSetSize)
     {
-	return (*pScrPriv->rrScreenSizeSet) (pScreen,
+	return (*pScrPriv->rrScreenSetSize) (pScreen,
 					     width, height,
 					     mmWidth, mmHeight);
     }
@@ -376,9 +376,14 @@ ProcRRGetScreenResources (ClientPtr client)
 		      ((rep.nbytesNames + 3) >> 2));
 	
 	extraLen = rep.length << 2;
+	if (extraLen)
+	{
 	    extra = xalloc (extraLen);
 	    if (!extra)
 		return BadAlloc;
+	}
+	else
+	    extra = NULL;
 
 	crtcs = (RRCrtc *) extra;
 	outputs = (RROutput *) (crtcs + pScrPriv->numCrtcs);
@@ -595,12 +600,18 @@ ProcRRGetScreenInfo (ClientPtr client)
 	extraLen = (rep.nSizes * sizeof (xScreenSizes) +
 		    rep.nrateEnts * sizeof (CARD16));
 
+	if (extraLen)
+	{
 	    extra = (CARD8 *) xalloc (extraLen);
 	    if (!extra)
 	    {
 		xfree (pData);
 		return BadAlloc;
 	    }
+	}
+	else
+	    extra = NULL;
+
 	/*
 	 * First comes the size information
 	 */