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net: stmmac: fix maxmtu assignment to be within valid range

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There is no checking valid value of maxmtu when getting it from
device tree. This resolution added the checking condition to
ensure the assignment is made within a valid range.

Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kweh, Hock Leong 2017-01-07 17:32:03 +08:00 committed by David S. Miller
parent 9d5ecb09d5
commit a2cd64f301
2 changed files with 15 additions and 1 deletions
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10
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -3319,8 +3319,16 @@ int stmmac_dvr_probe(struct device *device,
ndev->max_mtu = JUMBO_LEN;
else
ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
if (priv->plat->maxmtu < ndev->max_mtu)
/* Will not overwrite ndev->max_mtu if plat->maxmtu > ndev->max_mtu
* as well as plat->maxmtu < ndev->min_mtu which is a invalid range.
*/
if ((priv->plat->maxmtu < ndev->max_mtu) &&
(priv->plat->maxmtu >= ndev->min_mtu))
ndev->max_mtu = priv->plat->maxmtu;
else if (priv->plat->maxmtu < ndev->min_mtu)
netdev_warn(priv->dev,
"%s: warning: maxmtu having invalid value (%d)\n",
__func__, priv->plat->maxmtu);
if (flow_ctrl)
priv->flow_ctrl = FLOW_AUTO; /* RX/TX pause on */

6
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
View File

@ -89,6 +89,9 @@ static void stmmac_default_data(struct plat_stmmacenet_data *plat)
/* Set default value for unicast filter entries */
plat->unicast_filter_entries = 1;
/* Set the maxmtu to a default of JUMBO_LEN */
plat->maxmtu = JUMBO_LEN;
}
static int quark_default_data(struct plat_stmmacenet_data *plat,
@ -126,6 +129,9 @@ static int quark_default_data(struct plat_stmmacenet_data *plat,
/* Set default value for unicast filter entries */
plat->unicast_filter_entries = 1;
/* Set the maxmtu to a default of JUMBO_LEN */
plat->maxmtu = JUMBO_LEN;
return 0;
}