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-rw-r--r--block/dmg.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/dmg.c b/block/dmg.c
index be2f26e85e..f4f3e8e9f2 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -182,7 +182,7 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
offset += 4;
if (s->types[i] != 0x80000005 && s->types[i] != 1 &&
s->types[i] != 2) {
- if (s->types[i] == 0xffffffff) {
+ if (s->types[i] == 0xffffffff && i > 0) {
last_in_offset = s->offsets[i - 1] + s->lengths[i - 1];
last_out_offset = s->sectors[i - 1] +
s->sectorcounts[i - 1];