linux-kernel - Re: [PATCH] [NET] dmfe : number of fixes and features

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Message-ID: <386082.5155.qm@web38501.mail.mud.yahoo.com>
Date:	Wed, 7 Feb 2007 09:59:41 -0800 (PST)
From:	Levitsky Maxim <maximlevitsky@...oo.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [NET] dmfe : number of fixes and features

From: Maxim Levitsky <maximlevitsky@...oo.com>
Subject: [PATCH] [NET] [002] dmfe : Fix possible oops

Deallocate memory after driver is unregistred to prevent oops
Don't dereference NULL pointer that can be returned by dev_alloc_skb in case of oom

Signed-off-by: Maxim Levitsky <maximlevitsky@...oo.com>

---

--- linux-2.6.20-mod/drivers/net/tulip/dmfe.c	2007-02-07 18:27:07.000000000 +0200
+++ linux-2.6.20-test/drivers/net/tulip/dmfe.c	2007-02-07 18:27:59.000000000 +0200
@@ -497,13 +497,16 @@ static void __devexit dmfe_remove_one (s
 	DMFE_DBUG(0, "dmfe_remove_one()", 0);
 
  	if (dev) {
+		
+		unregister_netdev(dev);
+		pci_release_regions(pdev);
+		
+		
 		pci_free_consistent(db->pdev, sizeof(struct tx_desc) *
 					DESC_ALL_CNT + 0x20, db->desc_pool_ptr,
  					db->desc_pool_dma_ptr);
 		pci_free_consistent(db->pdev, TX_BUF_ALLOC * TX_DESC_CNT + 4,
 					db->buf_pool_ptr, db->buf_pool_dma_ptr);
-		unregister_netdev(dev);
-		pci_release_regions(pdev);
 		free_netdev(dev);	/* free board information */
 		pci_set_drvdata(pdev, NULL);
 	}
@@ -921,7 +924,7 @@ static inline u32 cal_CRC(unsigned char 
 static void dmfe_rx_packet(struct DEVICE *dev, struct dmfe_board_info * db)
 {
 	struct rx_desc *rxptr;
-	struct sk_buff *skb;
+	struct sk_buff *skb, *newskb;
 	int rxlen;
 	u32 rdes0;
 
@@ -974,8 +977,10 @@ static void dmfe_rx_packet(struct DEVICE
 					/* Good packet, send to upper layer */
 					/* Shorst packet used new SKB */
 					if ( (rxlen < RX_COPY_SIZE) &&
-						( (skb = dev_alloc_skb(rxlen + 2) )
+						( (newskb = dev_alloc_skb(rxlen + 2) )
 						!= NULL) ) {
+						
+						skb = newskb;
 						/* size less than COPY_SIZE, allocate a rxlen SKB */
 						skb->dev = dev;
 						skb_reserve(skb, 2); /* 16byte align */



 
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