1 files changed, 24 insertions, 9 deletions

diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 81accdf35168..c3d79eef9e32 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -11,7 +11,6 @@
  *
  */
 
-#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/poll.h>
@@ -340,6 +339,16 @@ isdn_command(isdn_ctrl *cmd)
 		printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
 		return(1);
 	}
+	if (!dev->drv[cmd->driver]) {
+		printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
+			cmd->command, cmd->driver);
+		return(1);
+	}
+	if (!dev->drv[cmd->driver]->interface) {
+		printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
+			cmd->command, cmd->driver);
+		return(1);
+	}
 	if (cmd->command == ISDN_CMD_SETL2) {
 		int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
 		unsigned long l2prot = (cmd->arg >> 8) & 255;
@@ -933,7 +942,7 @@ isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
 			count_put = count_pull;
 			if(count_put > 1)
 				tty_insert_flip_string(tty, skb->data, count_put - 1);
-			last = skb->data[count_put] - 1;
+			last = skb->data[count_put - 1];
 			len -= count_put;
 #ifdef CONFIG_ISDN_AUDIO
 		}
@@ -1050,7 +1059,7 @@ isdn_info_update(void)
 static ssize_t
 isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
 {
-	uint minor = MINOR(file->f_dentry->d_inode->i_rdev);
+	uint minor = iminor(file->f_dentry->d_inode);
 	int len = 0;
 	int drvidx;
 	int chidx;
@@ -1154,7 +1163,7 @@ isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
 static ssize_t
 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
 {
-	uint minor = MINOR(file->f_dentry->d_inode->i_rdev);
+	uint minor = iminor(file->f_dentry->d_inode);
 	int drvidx;
 	int chidx;
 	int retval;
@@ -1216,7 +1225,7 @@ static unsigned int
 isdn_poll(struct file *file, poll_table * wait)
 {
 	unsigned int mask = 0;
-	unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
+	unsigned int minor = iminor(file->f_dentry->d_inode);
 	int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
 
 	lock_kernel();
@@ -1257,7 +1266,7 @@ isdn_poll(struct file *file, poll_table * wait)
 static int
 isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
 {
-	uint minor = MINOR(inode->i_rdev);
+	uint minor = iminor(inode);
 	isdn_ctrl c;
 	int drvidx;
 	int chidx;
@@ -1708,7 +1717,7 @@ isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
 static int
 isdn_open(struct inode *ino, struct file *filep)
 {
-	uint minor = MINOR(ino->i_rdev);
+	uint minor = iminor(ino);
 	int drvidx;
 	int chidx;
 	int retval = -ENODEV;
@@ -1770,7 +1779,7 @@ isdn_open(struct inode *ino, struct file *filep)
 static int
 isdn_close(struct inode *ino, struct file *filep)
 {
-	uint minor = MINOR(ino->i_rdev);
+	uint minor = iminor(ino);
 
 	lock_kernel();
 	if (minor == ISDN_MINOR_STATUS) {
@@ -1903,6 +1912,11 @@ isdn_free_channel(int di, int ch, int usage)
 {
 	int i;
 
+	if ((di < 0) || (ch < 0)) {
+		printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
+			__FUNCTION__, di, ch);
+		return;
+	}
 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 		if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
 		    (dev->drvmap[i] == di) &&
@@ -1918,7 +1932,8 @@ isdn_free_channel(int di, int ch, int usage)
 			dev->v110[i] = NULL;
 // 20.10.99 JIM, try to reinitialize v110 !
 			isdn_info_update();
-			skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
+			if (dev->drv[di])
+				skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
 		}
 }