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-rw-r--r--disk/part_iso.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/disk/part_iso.c b/disk/part_iso.c
index 49639af..cc323b0 100644
--- a/disk/part_iso.c
+++ b/disk/part_iso.c
@@ -73,6 +73,9 @@ int get_partition_info_iso_verb(block_dev_desc_t * dev_desc, int part_num, disk_
iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
iso_init_def_entry_t *pide;
+ if (dev_desc->blksz != CD_SECTSIZE)
+ return -1;
+
/* the first sector (sector 0x10) must be a primary volume desc */
blkaddr=PVD_OFFSET;
if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)