[PATCH 4.12 13/52] net: systemport: Free DMA coherent descriptors on errors

From: Greg Kroah-Hartman
Date: Mon Sep 18 2017 - 05:48:55 EST

4.12-stable review patch. If anyone has any objections, please let me know.


From: Florian Fainelli <f.fainelli@xxxxxxxxx>

[ Upstream commit c2062ee3d9615828109ffe8089fbf69bed394d05 ]

In case bcm_sysport_init_tx_ring() is not able to allocate ring->cbs, we
would return with an error, and call bcm_sysport_fini_tx_ring() and it
would see that ring->cbs is NULL and do nothing. This would leak the
coherent DMA descriptor area, so we need to free it on error before

Reported-by: Eric Dumazet <edumazet@xxxxxxxxx>
Fixes: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/ethernet/broadcom/bcmsysport.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1342,6 +1342,8 @@ static int bcm_sysport_init_tx_ring(stru

ring->cbs = kcalloc(size, sizeof(struct bcm_sysport_cb), GFP_KERNEL);
if (!ring->cbs) {
+ dma_free_coherent(kdev, sizeof(struct dma_desc),
+ ring->desc_cpu, ring->desc_dma);
netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
return -ENOMEM;