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

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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index beeb612be98f..2bd9592b75cd 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -8454,6 +8454,9 @@ static int tg3_run_loopback(struct tg3 *tp, int loopback_mode)
 
         tx_len = 1514;
         skb = dev_alloc_skb(tx_len);
+        if (!skb)
+                return -ENOMEM;
+
         tx_data = skb_put(skb, tx_len);
         memcpy(tx_data, tp->dev->dev_addr, 6);
         memset(tx_data + 6, 0x0, 8);