b53: fix memory out of bounds access on 64 bit targets

On device reset the sizes for the vlan and port tables were wrongly
calculated based on the pointer size instead of the struct size. This
causes buffer overruns on 64 bit targets, resulting in panics.

Fix this by dereferencing the pointers.

Reported-by: Fedor Konstantinov <blmink@mink.su>
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45938 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
index 2b05d5d..47b5a8b 100644 (file)
--- a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
+++ b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
@@ -803,8 +803,8 @@ static int b53_global_reset_switch(struct switch_dev *dev)
        priv->enable_jumbo = 0;
        priv->allow_vid_4095 = 0;
 
-       memset(priv->vlans, 0, sizeof(priv->vlans) * dev->vlans);
-       memset(priv->ports, 0, sizeof(priv->ports) * dev->ports);
+       memset(priv->vlans, 0, sizeof(*priv->vlans) * dev->vlans);
+       memset(priv->ports, 0, sizeof(*priv->ports) * dev->ports);
 
        return b53_switch_reset(priv);
 }