Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> Reviewed-by: Eric Blake <ebl...@redhat.com> --- block/qcow2.h | 1 + block/qcow2-refcount.c | 12 +++++++++++- 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/block/qcow2.h b/block/qcow2.h index c0e1e83796..b8b1093b61 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -587,6 +587,7 @@ typedef enum QCow2MetadataOverlap { #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL +#define L2E_STD_RESERVED_MASK 0x3f000000000001feULL #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index 062ec48a15..47cc82449b 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -1682,8 +1682,18 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res, int csize; l2_entry = get_l2_entry(s, l2_table, i); uint64_t l2_bitmap = get_l2_bitmap(s, l2_table, i); + QCow2ClusterType type = qcow2_get_cluster_type(bs, l2_entry); - switch (qcow2_get_cluster_type(bs, l2_entry)) { + if (type != QCOW2_CLUSTER_COMPRESSED) { + /* Check reserved bits of Standard Cluster Descriptor */ + if (l2_entry & L2E_STD_RESERVED_MASK) { + fprintf(stderr, "ERROR found l2 entry with reserved bits set: " + "%" PRIx64, l2_entry); + res->corruptions++; + } + } + + switch (type) { case QCOW2_CLUSTER_COMPRESSED: /* Compressed clusters don't have QCOW_OFLAG_COPIED */ if (l2_entry & QCOW_OFLAG_COPIED) { -- 2.29.2