diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 8dcee5efec..3c754f616b 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -135,13 +135,16 @@ static ssize_t qcow2_crypto_hdr_init_func(QCryptoBlock *block, size_t headerlen, s->crypto_header.length = headerlen; s->crypto_header.offset = ret; - /* Zero fill remaining space in cluster so it has predictable - * content in case of future spec changes */ + /* + * Zero fill all space in cluster so it has predictable + * content, as we may not initialize some regions of the + * header (eg only 1 out of 8 key slots will be initialized) + */ clusterlen = size_to_clusters(s, headerlen) * s->cluster_size; assert(qcow2_pre_write_overlap_check(bs, 0, ret, clusterlen, false) == 0); ret = bdrv_pwrite_zeroes(bs->file, - ret + headerlen, - clusterlen - headerlen, 0); + ret, + clusterlen, 0); if (ret < 0) { error_setg_errno(errp, -ret, "Could not zero fill encryption header"); return -1; |