net: systemport: Free DMA coherent descriptors on errors

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 returning. Reported-by: Eric Dumazet <[email protected]> Fixes: 80105be ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver") Signed-off-by: Florian Fainelli <[email protected]> Signed-off-by: David S. Miller <[email protected]>
SELinuxProject · Aug 25, 2017 · c2062ee · c2062ee
1 parent d4fec85
commit c2062ee
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1346,6 +1346,8 @@ static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
 
 	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;
 	}