X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fusb%2Fhost%2Fuhci-debug.c;h=133e50c1b75aeef56f325655d0c6d6d9e67d28a7;hb=5d0dd51ddb446e7c058023420f5b7d4404501980;hp=a0721d06059eb48d6bc61cd006348f3190f0b076;hpb=a91482bdcc2e0f6035702e46f1b99043a0893346;p=linux-2.6.git

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index a0721d060..133e50c1b 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -571,7 +571,22 @@ static ssize_t uhci_proc_read(struct file *file, char __user *buf,
 				size_t nbytes, loff_t *ppos)
 {
 	struct uhci_proc *up = file->private_data;
-	return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
+	unsigned int pos;
+	unsigned int size;
+
+	pos = *ppos;
+	size = up->size;
+	if (pos >= size)
+		return 0;
+	if (nbytes > size - pos)
+		nbytes = size - pos;
+
+	if (copy_to_user(buf, up->data + pos, nbytes))
+		return -EFAULT;
+
+	*ppos += nbytes;
+
+	return nbytes;
 }
 
 static int uhci_proc_release(struct inode *inode, struct file *file)