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authorClaudiu Manoil <claudiu.manoil@freescale.com>2012-11-08 22:11:41 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-09 17:07:22 -0500
commit1eb8f7a7da6d3b36fcc339d7bbddbf8315a5c1dd (patch)
tree08367aa6aa5fa54af7a9d82d21a98195f050880e /drivers
parentbe44389964c1855ccffedbfbf5d2a943bb84ad66 (diff)
gianfar: Fix alloc_skb_resources on -ENOMEM cleanup path
Should gfar_init_bds() return with -ENOMEM inside gfar_alloc_skb_resources(), free_skb_resources() will be called twice in a row on the "cleanup" path, leading to duplicate kfree() calls for rx_|tx_queue->rx_|tx_skbuff resulting in segmentation fault. This patch prevents the segmentation fault to happen in the future (rx_|tx_sbkbuff set to NULL), and corrects the error path handling for gfar_init_bds(). Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com> Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/freescale/gianfar.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 1d03dcdd5e56..81a0f33d263f 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -210,7 +210,7 @@ static int gfar_init_bds(struct net_device *ndev)
skb = gfar_new_skb(ndev);
if (!skb) {
netdev_err(ndev, "Can't allocate RX buffers\n");
- goto err_rxalloc_fail;
+ return -ENOMEM;
}
rx_queue->rx_skbuff[j] = skb;
@@ -223,10 +223,6 @@ static int gfar_init_bds(struct net_device *ndev)
}
return 0;
-
-err_rxalloc_fail:
- free_skb_resources(priv);
- return -ENOMEM;
}
static int gfar_alloc_skb_resources(struct net_device *ndev)
@@ -1356,7 +1352,11 @@ static int gfar_restore(struct device *dev)
if (!netif_running(ndev))
return 0;
- gfar_init_bds(ndev);
+ if (gfar_init_bds(ndev)) {
+ free_skb_resources(priv);
+ return -ENOMEM;
+ }
+
init_registers(ndev);
gfar_set_mac_address(ndev);
gfar_init_mac(ndev);
@@ -1709,6 +1709,7 @@ static void free_skb_tx_queue(struct gfar_priv_tx_q *tx_queue)
tx_queue->tx_skbuff[i] = NULL;
}
kfree(tx_queue->tx_skbuff);
+ tx_queue->tx_skbuff = NULL;
}
static void free_skb_rx_queue(struct gfar_priv_rx_q *rx_queue)
@@ -1732,6 +1733,7 @@ static void free_skb_rx_queue(struct gfar_priv_rx_q *rx_queue)
rxbdp++;
}
kfree(rx_queue->rx_skbuff);
+ rx_queue->rx_skbuff = NULL;
}
/* If there are any tx skbs or rx skbs still around, free them.