[PATCH net 4/7] net: bcm4908_enet: unmap the buffer of a dropped RX frame

[Kordian Chmielewski (mlody1212)]

When poll_rx() drops a frame (too short, or not in a single buffer),
it frees the buffer without unmapping it first, so the memory goes
back to the page allocator while still mapped for the device. Unmap it
as the path for good frames does.

Fixes: 4dc7f09b8bec ("net: broadcom: bcm4908_enet: fix RX path possible mem leak")
Signed-off-by: Kordian Chmielewski (mlody1212) <kudzo51@xxxxxxxxx>
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
index 8008b44a4..778920e37 100644
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -653,6 +653,7 @@ static int bcm4908_enet_poll_rx(struct napi_struct *napi, int weight)
 
 		if (len < ETH_ZLEN ||
 		    (ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
+			dma_unmap_single(dev, slot.dma_addr, ENET_RX_BUF_DMA_SIZE, DMA_FROM_DEVICE);
 			skb_free_frag(slot.buf);
 			enet->netdev->stats.rx_dropped++;
 			break;
-- 
2.56.0