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Diffstat (limited to 'sys/arch/mac68k/dev/asc.c')
-rw-r--r--sys/arch/mac68k/dev/asc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/arch/mac68k/dev/asc.c b/sys/arch/mac68k/dev/asc.c
index e28c325f1d7..5cd6ce22626 100644
--- a/sys/arch/mac68k/dev/asc.c
+++ b/sys/arch/mac68k/dev/asc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: asc.c,v 1.7 1998/04/27 02:04:32 gene Exp $ */
+/* $OpenBSD: asc.c,v 1.8 1998/11/20 23:57:24 deraadt Exp $ */
/* $NetBSD: asc.c,v 1.20 1997/02/24 05:47:33 scottr Exp $ */
/*
@@ -281,7 +281,7 @@ ascmmap(dev, off, prot)
vm_offset_t pa;
sc = asc_cd.cd_devs[unit];
- if (off < MAC68K_ASC_LEN) {
+ if (off >= 0 && off < MAC68K_ASC_LEN) {
pa = pmap_extract(pmap_kernel(), (vm_offset_t)sc->sc_handle);
return mac68k_btop(pa + off);
}