diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index a9e7682..3954cf1 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -166,8 +166,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags) if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION) goto fail; - if (header.size <= 1 || - header.cluster_bits < MIN_CLUSTER_BITS || + if (header.cluster_bits < MIN_CLUSTER_BITS || header.cluster_bits > MAX_CLUSTER_BITS) goto fail; if (header.crypt_method > QCOW_CRYPT_AES) @@ -200,13 +199,15 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags) if (s->l1_size < s->l1_vm_state_index) goto fail; s->l1_table_offset = header.l1_table_offset; - s->l1_table = qemu_mallocz( - align_offset(s->l1_size * sizeof(uint64_t), 512)); - if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != - s->l1_size * sizeof(uint64_t)) - goto fail; - for(i = 0;i < s->l1_size; i++) { - be64_to_cpus(&s->l1_table[i]); + if (s->l1_size > 0) { + s->l1_table = qemu_mallocz( + align_offset(s->l1_size * sizeof(uint64_t), 512)); + if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != + s->l1_size * sizeof(uint64_t)) + goto fail; + for(i = 0;i < s->l1_size; i++) { + be64_to_cpus(&s->l1_table[i]); + } } /* alloc L2 cache */ s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |