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can: c_can: fix null-ptr-deref on ioctl() 

The pdev maybe not a platform device, e.g. c_can_pci device, in this
case, calling to_platform_device() would not make sense. Also, per the
comment in drivers/net/can/c_can/c_can_ethtool.c, @bus_info should
match dev_name() string, so I am replacing this with dev_name() to fix
this issue.

[    1.458583] BUG: unable to handle page fault for address: 0000000100000000
[    1.460921] RIP: 0010:strnlen+0x1a/0x30
[    1.466336]  ? c_can_get_drvinfo+0x65/0xb0 [c_can]
[    1.466597]  ethtool_get_drvinfo+0xae/0x360
[    1.466826]  dev_ethtool+0x10f8/0x2970
[    1.467880]  sock_ioctl+0xef/0x300

Fixes: 2722ac986e ("can: c_can: add ethtool support")
Link: https://lore.kernel.org/r/20210906233704.1162666-1-ztong0001@gmail.com
Cc: stable@vger.kernel.org # 5.14+
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Tong Zhang 2021-09-06 16:37:02 -07:00 committed by Marc Kleine-Budde
parent 54d7a47a00
commit 644d0a5bcc
1 changed files with 1 additions and 3 deletions
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4
drivers/net/can/c_can/c_can_ethtool.c
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@ -15,10 +15,8 @@ static void c_can_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *info)
{
struct c_can_priv *priv = netdev_priv(netdev);
struct platform_device *pdev = to_platform_device(priv->device);
strscpy(info->driver, "c_can", sizeof(info->driver));
strscpy(info->bus_info, pdev->name, sizeof(info->bus_info));
strscpy(info->bus_info, dev_name(priv->device), sizeof(info->bus_info));
}
static void c_can_get_ringparam(struct net_device *netdev,