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staging: vme_user: switch to returning -EFAULT on __copy_*_user errors 

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Kalinkin 2015-06-26 23:39:41 +03:00 committed by Greg Kroah-Hartman
parent 8e4d138cc0
commit 7c78e0cdd0
1 changed files with 11 additions and 36 deletions
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47
drivers/staging/vme/devices/vme_user.c
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@ -123,7 +123,6 @@ struct vme_user_vma_priv {
static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
loff_t *ppos)
{
ssize_t retval;
ssize_t copied = 0;
if (count > image[minor].size_buf)
@ -135,13 +134,8 @@ static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
if (copied < 0)
return (int)copied;
retval = __copy_to_user(buf, image[minor].kern_buf,
(unsigned long)copied);
if (retval != 0) {
copied = (copied - retval);
pr_info("User copy failed\n");
return -EINVAL;
}
if (__copy_to_user(buf, image[minor].kern_buf, (unsigned long)copied))
return -EFAULT;
return copied;
}
@ -149,21 +143,16 @@ static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t retval;
ssize_t copied = 0;
if (count > image[minor].size_buf)
count = image[minor].size_buf;
retval = __copy_from_user(image[minor].kern_buf, buf,
(unsigned long)count);
if (retval != 0)
copied = (copied - retval);
else
copied = count;
if (__copy_from_user(image[minor].kern_buf, buf, (unsigned long)count))
return -EFAULT;
copied = vme_master_write(image[minor].resource, image[minor].kern_buf,
copied, *ppos);
count, *ppos);
return copied;
}
@ -172,38 +161,24 @@ static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
size_t count, loff_t *ppos)
{
void *image_ptr;
ssize_t retval;
image_ptr = image[minor].kern_buf + *ppos;
if (__copy_to_user(buf, image_ptr, (unsigned long)count))
return -EFAULT;
retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
if (retval != 0) {
retval = (count - retval);
pr_warn("Partial copy to userspace\n");
} else
retval = count;
/* Return number of bytes successfully read */
return retval;
return count;
}
static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
size_t count, loff_t *ppos)
{
void *image_ptr;
size_t retval;
image_ptr = image[minor].kern_buf + *ppos;
if (__copy_from_user(image_ptr, buf, (unsigned long)count))
return -EFAULT;
retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
if (retval != 0) {
retval = (count - retval);
pr_warn("Partial copy to userspace\n");
} else
retval = count;
/* Return number of bytes successfully read */
return retval;
return count;
}
static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count,