X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/fd883ff8b15778611731b6e7c9cdacb5470c3901..46e2f34c15f734054295e3a2a2d68828247bcd86:/lincan/src/read.c

diff --git a/lincan/src/read.c b/lincan/src/read.c
index c16c76b..a6f5305 100644
--- a/lincan/src/read.c
+++ b/lincan/src/read.c
@@ -54,19 +54,21 @@ ssize_t can_read(struct file *file, char *buffer, size_t length, loff_t *offset)
 		}
 	}
 	
-	copy_to_user(buffer, &slot->msg, sizeof(struct canmsg_t));
+	ret = copy_to_user(buffer, &slot->msg, sizeof(struct canmsg_t));
 	canque_free_outslot(qends, qedge, slot);
 	buffer += sizeof(struct canmsg_t);
 	bytes_to_copy = length-sizeof(struct canmsg_t);
+	if(ret)	return -EFAULT;
 	
 	while (bytes_to_copy > 0) {
 		ret=canque_test_outslot(qends, &qedge, &slot);
 		if(ret<0)
 			break;
-		copy_to_user(buffer, &slot->msg, sizeof(struct canmsg_t));
+		ret = copy_to_user(buffer, &slot->msg, sizeof(struct canmsg_t));
 		canque_free_outslot(qends, qedge, slot);
 		buffer += sizeof(struct canmsg_t);
 		bytes_to_copy -= sizeof(struct canmsg_t);
+		if(ret)	return -EFAULT;
 	}
 
 	return length-bytes_to_copy;