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Staging: comedi: comedi_open: Fix null pointer dereference.

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This can happen if other minor devices are used.

From: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: David Schleef <ds@schleef.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Abbott
2009-02-09 16:51:38 +00:00
committed by Greg Kroah-Hartman
parent 56d92c60e6
commit 979200719d
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/comedi/comedi_fops.c
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@@ -1760,7 +1760,8 @@ static int comedi_open(struct inode *inode, struct file *file)
const unsigned minor = iminor(inode); const unsigned minor = iminor(inode);
struct comedi_device_file_info *dev_file_info = struct comedi_device_file_info *dev_file_info =
comedi_get_device_file_info(minor); comedi_get_device_file_info(minor);
comedi_device *dev = dev_file_info->device; comedi_device *dev = dev_file_info ? dev_file_info->device : NULL;
if (dev == NULL) { if (dev == NULL) {
DPRINTK("invalid minor number\n"); DPRINTK("invalid minor number\n");
return -ENODEV; return -ENODEV;