[PATCH 2/4 v2] misc: xilinx_sdfec: Return -EFAULT if copy_from_user() fails

Dan Carpenter
2019-08-22T08:31:22Z

The copy_from_user() function returns the number of bytes remaining to
be copied but we want to return -EFAULT to the user.

Fixes: 20ec628e8007 ("misc: xilinx_sdfec: Add ability to configure LDPC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
---
v2: Fix a typo in the commit message. funciton --> function

drivers/misc/xilinx_sdfec.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index dc1b8b412712..813b82c59360 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -651,9 +651,10 @@ static int xsdfec_add_ldpc(struct xsdfec_dev *xsdfec, void __user *arg)
if (!ldpc)
return -ENOMEM;

- ret = copy_from_user(ldpc, arg, sizeof(*ldpc));
- if (ret)
+ if (copy_from_user(ldpc, arg, sizeof(*ldpc))) {
+ ret = -EFAULT;
goto err_out;
+ }

if (xsdfec->config.code == XSDFEC_TURBO_CODE) {
ret = -EIO;
--
2.20.1