From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 15 Jul 2016 22:42:52 +0000 (-0700)
Subject: net: bgmac: Fix infinite loop in bgmac_dma_tx_add()
X-Git-Tag: v4.7~2^2~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e86663c475d384ab5f46cb5637e9b7ad08c5c505;p=platform%2Fkernel%2Flinux-exynos.git

net: bgmac: Fix infinite loop in bgmac_dma_tx_add()

Nothing is decrementing the index "i" while we are cleaning up the
fragments we could not successful transmit.

Fixes: 9cde94506eacf ("bgmac: implement scatter/gather support")
Reported-by: coverity (CID 1352048)
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index a6333d3..25bbae5 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -231,7 +231,7 @@ err_dma:
 	dma_unmap_single(dma_dev, slot->dma_addr, skb_headlen(skb),
 			 DMA_TO_DEVICE);
 
-	while (i > 0) {
+	while (i-- > 0) {
 		int index = (ring->end + i) % BGMAC_TX_RING_SLOTS;
 		struct bgmac_slot_info *slot = &ring->slots[index];
 		u32 ctl1 = le32_to_cpu(ring->cpu_base[index].ctl1);