[char-misc-next 3/5] mei: mei_write correct checks for copy_from_user

From: Tomas Winkler
Date: Sun Sep 01 2013 - 20:12:41 EST


From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>

1. return -EFUALT when copy_from_user fails
2. display error message on failure in error level

Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
drivers/misc/mei/main.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 173ff09..5ff810b 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -404,8 +404,11 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
goto out;

rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
- if (rets)
+ if (rets) {
+ dev_err(&dev->pdev->dev, "failed to copy data from userland\n");
+ rets = -EFAULT;
goto out;
+ }

if (cl == &dev->iamthif_cl) {
rets = mei_amthif_write(dev, write_cb);
@@ -567,7 +570,7 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
if (copy_from_user(connect_data, (char __user *)data,
sizeof(struct mei_connect_client_data))) {
- dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
+ dev_err(&dev->pdev->dev, "failed to copy data from userland\n");
rets = -EFAULT;
goto out;
}
--
1.8.3.1

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