mv643xx_eth: potential null dereference

We assume that "pd" can be null on the previous line, and throughout the
function so we should check it here as well.  This was introduced by
9b2c2ff7a1c0 "mv643xx_eth: use sw csum for big packets"

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 2fcdb1e1b99d068ab4791752c53f52a42f14f97a..2d488abcf62d7c789a84583dd1ad7564c00ba80c 100644 (file)
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -2675,7 +2675,8 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
         * Detect hardware parameters.
         */
        msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000;
-       msp->tx_csum_limit = pd->tx_csum_limit ? pd->tx_csum_limit : 9 * 1024;
+       msp->tx_csum_limit = (pd != NULL && pd->tx_csum_limit) ?
+                                       pd->tx_csum_limit : 9 * 1024;
        infer_hw_params(msp);
 
        platform_set_drvdata(pdev, msp);