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authorAlexander Usyskin <alexander.usyskin@intel.com>2014-03-12 13:19:13 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-17 15:53:28 -0700
commitdbac4745270bb8a8c5f119d21ce25764e9d7557d (patch)
tree3c0a5fa053eba76b030f9bd451f8b75321ddb264 /drivers/misc
parent80260f2360d34912cd8cb18aca6eda20e9db2ef0 (diff)
downloadop-kernel-dev-dbac4745270bb8a8c5f119d21ce25764e9d7557d.zip
op-kernel-dev-dbac4745270bb8a8c5f119d21ce25764e9d7557d.tar.gz
mei: report consistently copy_from/to_user failures
Consistently display error on possible copy_from/to_user failures use dev_dbg so it cannot be abused to flood the kernel log Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/amthif.c4
-rw-r--r--drivers/misc/mei/main.c5
2 files changed, 6 insertions, 3 deletions
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index b75a7da..2052609 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -244,8 +244,10 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
* the buf_idx may point beyond */
length = min_t(size_t, length, (cb->buf_idx - *offset));
- if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
+ if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
+ dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
rets = -EFAULT;
+ }
else {
rets = length;
if ((*offset + length) < cb->buf_idx) {
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 4e069b8..bc1c39e 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -280,6 +280,7 @@ copy_buffer:
length = min_t(size_t, length, cb->buf_idx - *offset);
if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
+ dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
rets = -EFAULT;
goto free;
}
@@ -400,7 +401,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
if (rets) {
- dev_err(&dev->pdev->dev, "failed to copy data from userland\n");
+ dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
rets = -EFAULT;
goto out;
}
@@ -565,7 +566,7 @@ 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_err(&dev->pdev->dev, "failed to copy data from userland\n");
+ dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
rets = -EFAULT;
goto out;
}
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