diff options
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index e7c5f486cd..5b36018b3e 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1119,6 +1119,17 @@ static int handle_alloc(BlockDriverState *bs, uint64_t guest_offset, return 0; } + /* !*host_offset would overwrite the image header and is reserved for "no + * host offset preferred". If 0 was a valid host offset, it'd trigger the + * following overlap check; do that now to avoid having an invalid value in + * *host_offset. */ + if (!alloc_cluster_offset) { + ret = qcow2_pre_write_overlap_check(bs, 0, alloc_cluster_offset, + nb_clusters * s->cluster_size); + assert(ret < 0); + goto fail; + } + /* * Save info needed for meta data update. * |