staging: comedi: check return code of put_user
Function put_user may fail. Check for it.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 1409131..98fa255 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -537,7 +537,8 @@
x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
(s->range_table_list[i]->length);
- put_user(x, it.rangelist + i);
+ if (put_user(x, it.rangelist + i))
+ return -EFAULT;
}
#if 0
if (copy_to_user(it.rangelist, s->range_type_list,