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-rw-r--r--sys/arch/amd64/stand/efiboot/efidev.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/arch/amd64/stand/efiboot/efidev.c b/sys/arch/amd64/stand/efiboot/efidev.c
index 64dde530543..b0cac089f14 100644
--- a/sys/arch/amd64/stand/efiboot/efidev.c
+++ b/sys/arch/amd64/stand/efiboot/efidev.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: efidev.c,v 1.17 2016/05/01 10:43:05 krw Exp $ */
+/* $OpenBSD: efidev.c,v 1.18 2016/05/06 03:13:52 yasuoka Exp $ */
/*
* Copyright (c) 1996 Michael Shalayeff
@@ -88,6 +88,9 @@ efid_io(int rw, efi_diskinfo_t ed, u_int off, int nsect, void *buf)
/* block count of the intrisic block size in DEV_BSIZE */
blks = EFI_BLKSPERSEC(ed);
+ if (blks == 0)
+ /* block size < 512. HP Stream 13 actually has such a disk. */
+ return (EFI_UNSUPPORTED);
lba = off / blks;
/* leading and trailing unaligned blocks in intrisic block */