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authorJesper Juhl <jesper.juhl@gmail.com>2006-05-09 23:14:35 -0700
committerDavid S. Miller <davem@davemloft.net>2006-05-09 23:14:35 -0700
commita50bb7b9af9a7c39b2aba15678eb686ae428718c (patch)
treef741922e4dbc4920548d7d4b68cf5eb37c11f85e
parent8c1056839e808aad728db86d739ffec71d2d1db8 (diff)
[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>
-rw-r--r--drivers/net/tg3.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index beeb612be98..2bd9592b75c 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);