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Staging: comedi: fix bug with invalid minor number usage. 

Return error instead of segfaulting if user trys to run comedi_config on
a device file with and invalid minor number.

From: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: David Schleef <ds@schleef.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Frank Mori Hess 2008-12-15 13:48:47 +00:00 committed by Greg Kroah-Hartman
parent a3cb729ef4
commit 53b670a75b
1 changed files with 5 additions and 1 deletions
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6
drivers/staging/comedi/comedi_fops.c
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@ -104,9 +104,13 @@ static int comedi_ioctl(struct inode *inode, struct file *file,
const unsigned minor = iminor(file->f_dentry->d_inode);
struct comedi_device_file_info *dev_file_info =
comedi_get_device_file_info(minor);
comedi_device *dev = dev_file_info->device;
comedi_device *dev;
int rc;
if (dev_file_info == NULL || dev_file_info->device == NULL)
return -ENODEV;
dev = dev_file_info->device;
mutex_lock(&dev->mutex);
/* Device config is special, because it must work on