diff options
| author | Jeff Cody <jcody@redhat.com> | 2014-09-16 15:12:06 -0400 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-09-22 11:39:46 +0100 |
| commit | e91a8b2fef92e7d31290e785a35f85a503fa1356 (patch) | |
| tree | 8e37ecb3074b11a55ca915b0d36424297acdc785 | |
| parent | 550830f9351291c585c963204ad9127998b1c1ce (diff) | |
block: vhdx - fix reading beyond pointer during image creation
In vhdx_create_metadata(), we allocate 40 bytes to entry_buffer for
the various metadata table entries. However, we write out 64kB from
that buffer into the new file. Only write out the correct 40 bytes.
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | block/vhdx.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/block/vhdx.c b/block/vhdx.c index d9aa2c14ed..22a4fb832c 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1408,6 +1408,12 @@ exit: return ret; } +#define VHDX_METADATA_ENTRY_BUFFER_SIZE \ + (sizeof(VHDXFileParameters) +\ + sizeof(VHDXVirtualDiskSize) +\ + sizeof(VHDXPage83Data) +\ + sizeof(VHDXVirtualDiskLogicalSectorSize) +\ + sizeof(VHDXVirtualDiskPhysicalSectorSize)) /* * Create the Metadata entries. @@ -1446,11 +1452,7 @@ static int vhdx_create_new_metadata(BlockDriverState *bs, VHDXVirtualDiskLogicalSectorSize *mt_log_sector_size; VHDXVirtualDiskPhysicalSectorSize *mt_phys_sector_size; - entry_buffer = g_malloc0(sizeof(VHDXFileParameters) + - sizeof(VHDXVirtualDiskSize) + - sizeof(VHDXPage83Data) + - sizeof(VHDXVirtualDiskLogicalSectorSize) + - sizeof(VHDXVirtualDiskPhysicalSectorSize)); + entry_buffer = g_malloc0(VHDX_METADATA_ENTRY_BUFFER_SIZE); mt_file_params = entry_buffer; offset += sizeof(VHDXFileParameters); @@ -1531,7 +1533,7 @@ static int vhdx_create_new_metadata(BlockDriverState *bs, } ret = bdrv_pwrite(bs, metadata_offset + (64 * KiB), entry_buffer, - VHDX_HEADER_BLOCK_SIZE); + VHDX_METADATA_ENTRY_BUFFER_SIZE); if (ret < 0) { goto exit; } @@ -1726,7 +1728,6 @@ static int vhdx_create_new_region_table(BlockDriverState *bs, goto exit; } - exit: g_free(s); g_free(buffer); @@ -1877,7 +1878,6 @@ static int vhdx_create(const char *filename, QemuOpts *opts, Error **errp) } - delete_and_exit: bdrv_unref(bs); exit: |