X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/b29ebe97fb5acced24e8ce9bb30e5d4dcad58815..3c47a7cd435662f7e2daa006596722271f5dd090:/lincan/src/open.c

diff --git a/lincan/src/open.c b/lincan/src/open.c
index 942225a..266aed4 100644
--- a/lincan/src/open.c
+++ b/lincan/src/open.c
@@ -50,15 +50,21 @@ int can_open(struct inode *inode, struct file *file)
 	struct canque_edge_t *edge;
 	can_spin_irqflags_t iflags;
 	char openflag;		// Martin Petera: Object already opened
+	int minor_nr = INODE2MINOR_NR(inode);
 
-	if ( ((obj=objects_p[MINOR_NR]) == NULL) ||
-			((chip=objects_p[MINOR_NR]->hostchip) == NULL) ) {
-		CANMSG("There is no hardware support for the device file with minor nr.: %d\n",MINOR_NR);
+	if ((minor_nr < 0) || (minor_nr >= MAX_TOT_MSGOBJS)) {
+		CANMSG("can_open: bad minor %d\n", minor_nr);
+		return -ENODEV;
+	}
+
+	if ( ((obj=objects_p[minor_nr]) == NULL) ||
+	    ((chip=objects_p[minor_nr]->hostchip) == NULL) ) {
+		CANMSG("There is no hardware support for the device file with minor nr.: %d\n", minor_nr);
 		return -ENODEV;
 	}
 
 	atomic_inc(&obj->obj_used);
-	DEBUGMSG("Device %d opened %d times.\n", MINOR_NR, atomic_read(&obj->obj_used));
+	DEBUGMSG("Device %d opened %d times.\n", minor_nr, atomic_read(&obj->obj_used));
 	openflag = can_msgobj_test_fl(obj,OPENED);	// Martin Petera: store previous status
 	can_msgobj_set_fl(obj,OPENED);