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-rw-r--r--block/vmdk.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/vmdk.c b/block/vmdk.c
index f94c49a..84f8bbe 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -47,6 +47,8 @@
#define VMDK4_FLAG_MARKER (1 << 17)
#define VMDK4_GD_AT_END 0xffffffffffffffffULL
+#define VMDK_EXTENT_MAX_SECTORS (1ULL << 32)
+
#define VMDK_GTE_ZEROED 0x1
/* VMDK internal error codes */
@@ -1250,6 +1252,10 @@ static int get_cluster_offset(BlockDriverState *bs,
return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
}
+ if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) {
+ return VMDK_ERROR;
+ }
+
cluster_sector = extent->next_cluster_sector;
extent->next_cluster_sector += extent->cluster_sectors;