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[TG3]: Fix possible NULL deref in tg3_run_loopback().

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tg3_run_loopback doesn't check that dev_alloc_skb() returns anything
useful.

Even if dev_alloc_skb() fails to return an skb to us we'll happily go
on and assume it did, so we risk dereferencing a NULL pointer.  Much
better to fail gracefully by returning -ENOMEM than crashing here.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2006-05-09 23:14:35 -07:00 committed by David S. Miller
parent 8c1056839e
commit a50bb7b9af
1 changed files with 3 additions and 0 deletions
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3
drivers/net/tg3.c
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@ -8454,6 +8454,9 @@ static int tg3_run_loopback(struct tg3 *tp, int loopback_mode)
tx_len = 1514; tx_len = 1514;
skb = dev_alloc_skb(tx_len); skb = dev_alloc_skb(tx_len);
if (!skb)
return -ENOMEM;
tx_data = skb_put(skb, tx_len); tx_data = skb_put(skb, tx_len);
memcpy(tx_data, tp->dev->dev_addr, 6); memcpy(tx_data, tp->dev->dev_addr, 6);
memset(tx_data + 6, 0x0, 8); memset(tx_data + 6, 0x0, 8);