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Staging: batman-adv: avoid crash on memory allocation error 

skb_share_check() returns NULL if it can't allocate more memory but
it still frees the skbuff.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marek Lindner 2010-02-19 16:18:10 +01:00 committed by Greg Kroah-Hartman
parent 8d03847c09
commit da6d6c7ac3
1 changed files with 9 additions and 7 deletions
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16
drivers/staging/batman-adv/hard-interface.c
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@ -426,10 +426,11 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct net_device_stats *stats;
int ret;
skb = skb_share_check(skb, GFP_ATOMIC);
skb = skb_share_check(skb, GFP_ATOMIC);
if (skb == NULL)
goto err_free;
/* skb was released by skb_share_check() */
if (!skb)
goto err_out;
/* packet should hold at least type and version */
if (unlikely(skb_headlen(skb) < 2))
@ -444,7 +445,7 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
if (!batman_if)
goto err_free;
stats = (struct net_device_stats *) dev_get_stats(skb->dev);
stats = (struct net_device_stats *)dev_get_stats(skb->dev);
if (stats) {
stats->rx_packets++;
stats->rx_bytes += skb->len;
@ -490,6 +491,7 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
default:
ret = NET_RX_DROP;
}
if (ret == NET_RX_DROP)
kfree_skb(skb);
@ -500,9 +502,9 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
return NET_RX_SUCCESS;
err_free:
kfree_skb(skb);
return NET_RX_DROP;
kfree_skb(skb);
err_out:
return NET_RX_DROP;
}