cns3xxx: prevent the ethernet driver from accessing uninitialized dma descriptor entries

SVN-Revision: 35950
12 years ago · ee2b511e1f
parent d22ac8d8fb
commit ee2b511e1f
1 changed files with 2 additions and 1 deletions
--- a/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
+++ b/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
@ -619,8 +619,9 @@ static int eth_poll(struct napi_struct *napi, int budget)
 	unsigned int length;
 	unsigned int i = rx_ring->cur_index;
 	struct rx_desc *desc = &(rx_ring)->desc[i];
+	unsigned int alloc_count = rx_ring->alloc_count;

-	while (desc->cown) {
+	while (desc->cown && alloc_count + received < RX_DESCS - 1) {
 		struct sk_buff *skb;
 		int reserve = SKB_HEAD_ALIGN;