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fddi: use ndo_siocdevprivate 

The skfddi driver has a private ioctl and passes the data correctly
through ifr_data, but the use of a pointer in s_skfp_ioctl is
broken in compat mode.

Change the driver to use ndo_siocdevprivate and disallow calling
it in compat mode until a conversion handler is added.

Cc: "Maciej W. Rozycki" <macro@orcam.me.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2021-07-27 15:44:59 +02:00 committed by David S. Miller
parent d92f7b59d3
commit 043393d8b4
1 changed files with 12 additions and 7 deletions
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19
drivers/net/fddi/skfp/skfddi.c
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@ -70,6 +70,7 @@ static const char * const boot_msg =
/* Include files */ /* Include files */
#include <linux/capability.h> #include <linux/capability.h>
#include <linux/compat.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/errno.h> #include <linux/errno.h>
@ -103,7 +104,8 @@ static struct net_device_stats *skfp_ctl_get_stats(struct net_device *dev);
static void skfp_ctl_set_multicast_list(struct net_device *dev); static void skfp_ctl_set_multicast_list(struct net_device *dev);
static void skfp_ctl_set_multicast_list_wo_lock(struct net_device *dev); static void skfp_ctl_set_multicast_list_wo_lock(struct net_device *dev);
static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr); static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr);
static int skfp_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); static int skfp_siocdevprivate(struct net_device *dev, struct ifreq *rq,
void __user *data, int cmd);
static netdev_tx_t skfp_send_pkt(struct sk_buff *skb, static netdev_tx_t skfp_send_pkt(struct sk_buff *skb,
struct net_device *dev); struct net_device *dev);
static void send_queued_packets(struct s_smc *smc); static void send_queued_packets(struct s_smc *smc);
@ -164,7 +166,7 @@ static const struct net_device_ops skfp_netdev_ops = {
.ndo_get_stats = skfp_ctl_get_stats, .ndo_get_stats = skfp_ctl_get_stats,
.ndo_set_rx_mode = skfp_ctl_set_multicast_list, .ndo_set_rx_mode = skfp_ctl_set_multicast_list,
.ndo_set_mac_address = skfp_ctl_set_mac_address, .ndo_set_mac_address = skfp_ctl_set_mac_address,
.ndo_do_ioctl = skfp_ioctl, .ndo_siocdevprivate = skfp_siocdevprivate,
}; };
/* /*
@ -932,9 +934,9 @@ static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr)
/* /*
* ============== * =======================
* = skfp_ioctl = * = skfp_siocdevprivate =
* ============== * =======================
* *
* Overview: * Overview:
* *
@ -954,16 +956,19 @@ static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr)
*/ */
static int skfp_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) static int skfp_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd)
{ {
struct s_smc *smc = netdev_priv(dev); struct s_smc *smc = netdev_priv(dev);
skfddi_priv *lp = &smc->os; skfddi_priv *lp = &smc->os;
struct s_skfp_ioctl ioc; struct s_skfp_ioctl ioc;
int status = 0; int status = 0;
if (copy_from_user(&ioc, rq->ifr_data, sizeof(struct s_skfp_ioctl))) if (copy_from_user(&ioc, data, sizeof(struct s_skfp_ioctl)))
return -EFAULT; return -EFAULT;
if (in_compat_syscall())
return -EOPNOTSUPP;
switch (ioc.cmd) { switch (ioc.cmd) {
case SKFP_GET_STATS: /* Get the driver statistics */ case SKFP_GET_STATS: /* Get the driver statistics */
ioc.len = sizeof(lp->MacStat); ioc.len = sizeof(lp->MacStat);