isdn: get rid of pointless access_ok()

copy_to_user()/copy_from_user()/get_user() check themselves

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 0 insertions, 26 deletions

diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 9b856e1890d1..89b09c51ab7c 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1304,9 +1304,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
                         if (arg) {
                                 ulong __user *p = argp;
                                 int i;
-                                if (!access_ok(VERIFY_WRITE, p,
-                                               sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
-                                        return -EFAULT;
                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                         put_user(dev->ibytes[i], p++);
                                         put_user(dev->obytes[i], p++);
@@ -1540,11 +1537,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
                                 char __user *p = argp;
                                 int i;
 
-                                if (!access_ok(VERIFY_WRITE, argp,
-                                               (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
-                                               * ISDN_MAX_CHANNELS))
-                                        return -EFAULT;
-
                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                         if (copy_to_user(p, dev->mdm.info[i].emu.profile,
                                                          ISDN_MODEM_NUMREG))
@@ -1567,11 +1559,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
                                 char __user *p = argp;
                                 int i;
 
-                                if (!access_ok(VERIFY_READ, argp,
-                                               (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
-                                               * ISDN_MAX_CHANNELS))
-                                        return -EFAULT;
-
                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                         if (copy_from_user(dev->mdm.info[i].emu.profile, p,
                                                            ISDN_MODEM_NUMREG))
@@ -1617,8 +1604,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
                                                 int j = 0;
 
                                                 while (1) {
-                                                        if (!access_ok(VERIFY_READ, p, 1))
-                                                                return -EFAULT;
                                                         get_user(bname[j], p++);
                                                         switch (bname[j]) {
                                                         case '\0':
@@ -1685,9 +1670,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
                                         drvidx = 0;
                                 if (drvidx == -1)
                                         return -ENODEV;
-                                if (!access_ok(VERIFY_WRITE, argp,
-                                               sizeof(isdn_ioctl_struct)))
-                                        return -EFAULT;
                                 c.driver = drvidx;
                                 c.command = ISDN_CMD_IOCTL;
                                 c.arg = cmd;
diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index d07dd5196ffc..487478bafaf5 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -795,9 +795,6 @@ isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
         if (!(is->state & IPPP_OPEN))
                 return 0;
 
-        if (!access_ok(VERIFY_WRITE, buf, count))
-                return -EFAULT;
-
         spin_lock_irqsave(&is->buflock, flags);
         b = is->first->next;
         save_buf = b->buf;
@@ -2014,9 +2011,6 @@ isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev)
         struct ppp_stats t;
         isdn_net_local *lp = netdev_priv(dev);
 
-        if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats)))
-                return -EFAULT;
-
         /* build a temporary stat struct and copy it to user space */
 
         memset(&t, 0, sizeof(struct ppp_stats));
diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index ef9c8e4f1fa2..32cb0cbd7217 100644
--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -1142,8 +1142,6 @@ isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
                 case ISDNLOOP_IOCTL_DEBUGVAR:
                         return (ulong) card;
                 case ISDNLOOP_IOCTL_STARTUP:
-                        if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
-                                return -EFAULT;
                         return isdnloop_start(card, (isdnloop_sdef *) a);
                         break;
                 case ISDNLOOP_IOCTL_ADDCARD: