diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 8d0a09e..3639528 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -642,6 +642,13 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, s->nb_snapshots = header.nb_snapshots; /* read the level 1 table */ + if (header.l1_size > 0x2000000) { + /* 32 MB L1 table is enough for 2 PB images at 64k cluster size + * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ + error_setg(errp, "Active L1 table too large"); + ret = -EFBIG; + goto fail; + } s->l1_size = header.l1_size; l1_vm_state_index = size_to_l1(s, header.size); @@ -659,7 +666,16 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, ret = -EINVAL; goto fail; } + + ret = validate_table_offset(bs, header.l1_table_offset, + header.l1_size, sizeof(uint64_t)); + if (ret < 0) { + error_setg(errp, "Invalid L1 table offset"); + goto fail; + } s->l1_table_offset = header.l1_table_offset; + + if (s->l1_size > 0) { s->l1_table = g_malloc0( align_offset(s->l1_size * sizeof(uint64_t), 512)); |
