8139cp: fix coherent mapping leak in error path.

cp_open
[...]
        rc = cp_alloc_rings(cp);
        if (rc)
                return rc;

cp_alloc_rings
[...]
        mem = dma_alloc_coherent(&cp->pdev->dev, CP_RING_BYTES,
                                 &cp->ring_dma, GFP_KERNEL);

- cp_alloc_rings never frees the coherent mapping it allocates
- neither do cp_open when cp_alloc_rings fails

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index b01f83a044c4..609125a249d9 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -1060,17 +1060,22 @@ static int cp_init_rings (struct cp_private *cp)
 
 static int cp_alloc_rings (struct cp_private *cp)
 {
+        struct device *d = &cp->pdev->dev;
         void *mem;
+        int rc;
 
-        mem = dma_alloc_coherent(&cp->pdev->dev, CP_RING_BYTES,
-                                 &cp->ring_dma, GFP_KERNEL);
+        mem = dma_alloc_coherent(d, CP_RING_BYTES, &cp->ring_dma, GFP_KERNEL);
         if (!mem)
                 return -ENOMEM;
 
         cp->rx_ring = mem;
         cp->tx_ring = &cp->rx_ring[CP_RX_RING_SIZE];
 
-        return cp_init_rings(cp);
+        rc = cp_init_rings(cp);
+        if (rc < 0)
+                dma_free_coherent(d, CP_RING_BYTES, cp->rx_ring, cp->ring_dma);
+
+        return rc;
 }
 
 static void cp_clean_rings (struct cp_private *cp)