From 8d794763d5942841cb63919e19f4be7798afaa05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
Date: Tue, 16 Jan 2018 20:54:44 +0100
Subject: [PATCH] dprintf: remove redondant user address check.

check user_memcpy success.
---
 src/add-ons/kernel/drivers/common/dprintf.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/add-ons/kernel/drivers/common/dprintf.cpp b/src/add-ons/kernel/drivers/common/dprintf.cpp
index 1addfa201b..a97d692fe6 100644
--- a/src/add-ons/kernel/drivers/common/dprintf.cpp
+++ b/src/add-ons/kernel/drivers/common/dprintf.cpp
@@ -11,7 +11,6 @@
 
 
 #include <debug.h>
-#include <kernel.h>
 
 #include <Drivers.h>
 #include <KernelExport.h>
@@ -71,8 +70,6 @@ dprintf_read(void *cookie, off_t pos, void *buffer, size_t *length)
 static status_t
 dprintf_write(void *cookie, off_t pos, const void *buffer, size_t *_length)
 {
-	if (!IS_USER_ADDRESS(buffer))
-		return B_BAD_ADDRESS;
 	const char *str = (const char*)buffer;
 
 	int bytesLeft = *_length;
@@ -100,7 +97,8 @@ dprintf_write(void *cookie, off_t pos, const void *buffer, size_t *_length)
 				char localBuffer[512];
 				if (bytesLeft > (int)sizeof(localBuffer) - 1)
 					chunkSize = (int)sizeof(localBuffer) - 1;
-				user_memcpy(localBuffer, str, chunkSize);
+				if (user_memcpy(localBuffer, str, chunkSize) < B_OK)
+					return B_BAD_ADDRESS;
 				localBuffer[chunkSize] = '\0';
 
 				debug_puts(localBuffer, chunkSize);