X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/a682f9de48bcce43fba6141fbdb4d451914e0bb4..9c8ab08d7e8fca3916a7f91a3c001d151989137c:/lincan/src/write.c

diff --git a/lincan/src/write.c b/lincan/src/write.c
index dccade1..8a50bd3 100644
--- a/lincan/src/write.c
+++ b/lincan/src/write.c
@@ -1,11 +1,36 @@
-/* write.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
- * email:pisa@cmp.felk.cvut.cz
- * This software is released under the GPL-License.
- * Version lincan-0.3  17 Jun 2004
- */
+/**************************************************************************/
+/* File: write.c - systemcall to send messages through driver FIFOs       */
+/*                                                                        */
+/* LinCAN - (Not only) Linux CAN bus driver                               */
+/* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz>   */
+/* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz>             */
+/* Funded by OCERA and FRESCOR IST projects                               */
+/* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl>      */
+/*                                                                        */
+/* LinCAN is free software; you can redistribute it and/or modify it      */
+/* under terms of the GNU General Public License as published by the      */
+/* Free Software Foundation; either version 2, or (at your option) any    */
+/* later version.  LinCAN is distributed in the hope that it will be      */
+/* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
+/* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
+/* General Public License for more details. You should have received a    */
+/* copy of the GNU General Public License along with LinCAN; see file     */
+/* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
+/* Cambridge, MA 02139, USA.                                              */
+/*                                                                        */
+/* To allow use of LinCAN in the compact embedded systems firmware        */
+/* and RT-executives (RTEMS for example), main authors agree with next    */
+/* special exception:                                                     */
+/*                                                                        */
+/* Including LinCAN header files in a file, instantiating LinCAN generics */
+/* or templates, or linking other files with LinCAN objects to produce    */
+/* an application image/executable, does not by itself cause the          */
+/* resulting application image/executable to be covered by                */
+/* the GNU General Public License.                                        */
+/* This exception does not however invalidate any other reasons           */
+/* why the executable file might be covered by the GNU Public License.    */
+/* Publication of enhanced or derived LinCAN files is required although.  */
+/**************************************************************************/
 
 #include "../include/can.h"
 #include "../include/can_sysdep.h"
@@ -20,7 +45,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 	struct canque_ends_t *qends;
 	struct canque_edge_t *qedge;
 	struct canque_slot_t *slot;
-	int ret = 0;
+	int ret;
 	unsigned bytes_to_copy;
 
 	if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
@@ -53,7 +78,8 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 
 
 	/* Prepare first message */
-	copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+	ret = copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+	if(ret)	return -EFAULT;
 
 	/* Automatic selection of extended format if ID>2047 */
 	if (msg_buff.id & ~0x7ffl & MSG_ID_MASK ) msg_buff.flags |= MSG_EXT;
@@ -91,7 +117,8 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 	while (bytes_to_copy >= sizeof(struct canmsg_t)) {
 		bytes_to_copy -= sizeof(struct canmsg_t);
 		/* Prepare first message */
-		copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+		ret = copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+		if(ret)	return -EFAULT;
 
 		/* Automatic selection of extended format if ID>2047 */
 		if (msg_buff.id & ~0x7ffl & MSG_ID_MASK ) msg_buff.flags |= MSG_EXT;