Prevented SIGSEGVs when using -atip with my SCSI CD-ROM (sr,sg: no matter)

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2006.12.11.115802"
+#define Cdrskin_timestamP "2006.12.11.125222"

libburn/mmc.c

@@ -423,7 +423,9 @@ void mmc_read_toc(struct burn_drive *d)
 
 			}
 		}
-		if (tdata[3] < 100) {
+		if (tdata[0] <= 0 || tdata[0] > d->disc->sessions)
+			tdata[0] = d->disc->sessions;
+		if (tdata[3] < 100 && tdata[0] > 0) {
 			track = burn_track_create();
 			burn_session_add_track(d->disc->session[tdata[0] - 1],
 					       track, BURN_POS_END);

libburn/structure.c

@@ -386,13 +386,19 @@ int burn_disc_get_sectors(struct burn_disc *d)
 
 void burn_track_get_entry(struct burn_track *t, struct burn_toc_entry *entry)
 {
-	memcpy(entry, t->entry, sizeof(struct burn_toc_entry));
+	if (t->entry == NULL)
+		memset(entry, 0, sizeof(struct burn_toc_entry));
+	else
+		memcpy(entry, t->entry, sizeof(struct burn_toc_entry));
 }
 
 void burn_session_get_leadout_entry(struct burn_session *s,
 				    struct burn_toc_entry *entry)
 {
-	memcpy(entry, s->leadout_entry, sizeof(struct burn_toc_entry));
+	if (s->leadout_entry == NULL)
+		memset(entry, 0, sizeof(struct burn_toc_entry));
+	else
+		memcpy(entry, s->leadout_entry, sizeof(struct burn_toc_entry));
 }
 
 struct burn_session **burn_disc_get_sessions(struct burn_disc *d, int *num)