diff options
author | Fam Zheng <famz@redhat.com> | 2013-08-06 15:44:51 +0800 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2013-08-06 15:27:32 +0200 |
commit | 8aa1331c09a9b899f48d97f097bb49b7d458be1c (patch) | |
tree | de7c81ae02697f839077c7f997030493d1fbd6f6 /block | |
parent | ca6cbb657d66a7beb70f9d91848c80d1a72b1674 (diff) | |
download | hqemu-8aa1331c09a9b899f48d97f097bb49b7d458be1c.zip hqemu-8aa1331c09a9b899f48d97f097bb49b7d458be1c.tar.gz |
vmdk: check granularity field in opening
Granularity is used to calculate the cluster size and allocate r/w
buffer. Check the value from image before using it, so we don't abort()
for unbounded memory allocation.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r-- | block/vmdk.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/block/vmdk.c b/block/vmdk.c index 2c925da..015cbd4 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -385,15 +385,22 @@ static int vmdk_parent_open(BlockDriverState *bs) /* Create and append extent to the extent array. Return the added VmdkExtent * address. return NULL if allocation failed. */ -static VmdkExtent *vmdk_add_extent(BlockDriverState *bs, +static int vmdk_add_extent(BlockDriverState *bs, BlockDriverState *file, bool flat, int64_t sectors, int64_t l1_offset, int64_t l1_backup_offset, uint32_t l1_size, - int l2_size, unsigned int cluster_sectors) + int l2_size, uint64_t cluster_sectors, + VmdkExtent **new_extent) { VmdkExtent *extent; BDRVVmdkState *s = bs->opaque; + if (cluster_sectors > 0x200000) { + /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ + error_report("invalid granularity, image may be corrupt"); + return -EINVAL; + } + s->extents = g_realloc(s->extents, (s->num_extents + 1) * sizeof(VmdkExtent)); extent = &s->extents[s->num_extents]; @@ -416,7 +423,10 @@ static VmdkExtent *vmdk_add_extent(BlockDriverState *bs, extent->end_sector = extent->sectors; } bs->total_sectors = extent->end_sector; - return extent; + if (new_extent) { + *new_extent = extent; + } + return 0; } static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) @@ -475,12 +485,17 @@ static int vmdk_open_vmdk3(BlockDriverState *bs, if (ret < 0) { return ret; } - extent = vmdk_add_extent(bs, + + ret = vmdk_add_extent(bs, bs->file, false, le32_to_cpu(header.disk_sectors), le32_to_cpu(header.l1dir_offset) << 9, 0, 1 << 6, 1 << 9, - le32_to_cpu(header.granularity)); + le32_to_cpu(header.granularity), + &extent); + if (ret < 0) { + return ret; + } ret = vmdk_init_tables(bs, extent); if (ret) { /* free extent allocated by vmdk_add_extent */ @@ -580,13 +595,17 @@ static int vmdk_open_vmdk4(BlockDriverState *bs, if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; } - extent = vmdk_add_extent(bs, file, false, + ret = vmdk_add_extent(bs, file, false, le64_to_cpu(header.capacity), le64_to_cpu(header.gd_offset) << 9, l1_backup_offset, l1_size, le32_to_cpu(header.num_gtes_per_gte), - le64_to_cpu(header.granularity)); + le64_to_cpu(header.granularity), + &extent); + if (ret < 0) { + return ret; + } extent->compressed = le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; @@ -702,8 +721,11 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, /* FLAT extent */ VmdkExtent *extent; - extent = vmdk_add_extent(bs, extent_file, true, sectors, - 0, 0, 0, 0, sectors); + ret = vmdk_add_extent(bs, extent_file, true, sectors, + 0, 0, 0, 0, sectors, &extent); + if (ret < 0) { + return ret; + } extent->flat_start_offset = flat_offset << 9; } else if (!strcmp(type, "SPARSE")) { /* SPARSE extent */ |