Staging: rt2860: fix possible NULL dereferences

Allocations may fail, prevent NULL dereferences.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rt2860/common/ba_action.c

@@ -867,6 +867,8 @@ VOID BAOriSessionTearDown(
 			// force send specified TID DelBA
 			MLME_DELBA_REQ_STRUCT   DelbaReq;
 			MLME_QUEUE_ELEM *Elem = (MLME_QUEUE_ELEM *) kmalloc(sizeof(MLME_QUEUE_ELEM), MEM_ALLOC_FLAG);
+			if (Elem == NULL)
+				return;
 
 			NdisZeroMemory(&DelbaReq, sizeof(DelbaReq));
 			NdisZeroMemory(Elem, sizeof(MLME_QUEUE_ELEM));
@@ -900,6 +902,8 @@ VOID BAOriSessionTearDown(
 	{
 		MLME_DELBA_REQ_STRUCT   DelbaReq;
 		MLME_QUEUE_ELEM *Elem = (MLME_QUEUE_ELEM *) kmalloc(sizeof(MLME_QUEUE_ELEM), MEM_ALLOC_FLAG);
+		if (Elem == NULL)
+			return;
 
 		NdisZeroMemory(&DelbaReq, sizeof(DelbaReq));
 		NdisZeroMemory(Elem, sizeof(MLME_QUEUE_ELEM));

drivers/staging/rt2860/common/cmm_data.c

@@ -2011,6 +2011,8 @@ UINT deaggregate_AMSDU_announce(
 		{
 		    // avoid local heap overflow, use dyanamic allocation
 		   MLME_QUEUE_ELEM *Elem = (MLME_QUEUE_ELEM *) kmalloc(sizeof(MLME_QUEUE_ELEM), MEM_ALLOC_FLAG);
+		   if (Elem == NULL)
+			return;
 		   memmove(Elem->Msg+(LENGTH_802_11 + LENGTH_802_1_H), pPayload, PayloadSize);
 		   Elem->MsgLen = LENGTH_802_11 + LENGTH_802_1_H + PayloadSize;
 		   WpaEAPOLKeyAction(pAd, Elem);

drivers/staging/rt2860/rt_main_dev.c

@@ -777,6 +777,8 @@ INT __devinit   rt28xx_probe(
 
 	// Allocate RTMP_ADAPTER miniport adapter structure
 	handle = kmalloc(sizeof(struct os_cookie), GFP_KERNEL);
+	if (handle == NULL)
+		goto err_out_free_netdev;;
 	RT28XX_HANDLE_DEV_ASSIGN(handle, dev_p);
 
 	status = RTMPAllocAdapterBlock(handle, &pAd);