[PATCH 05/14] staging: comedi: check return code of put_user

[Kulikov Vasiliy]

From: Vasiliy Kulikov <segooon@xxxxxxxxx>

Function put_user may fail. Check for it.

Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx>
---
 I couldn't compile this driver at all, so it is not tested.

 drivers/staging/comedi/comedi_fops.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 1409131..a3c7183 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -537,7 +537,8 @@ static int do_chaninfo_ioctl(struct comedi_device *dev,
 
 			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,
-- 
1.7.0.4

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