diff options
| author | Jeff Cody <jcody@redhat.com> | 2017-08-07 08:38:20 -0400 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-08-08 14:37:00 +0200 |
| commit | 27539ac53154cf9da6990ce9bec1064d37cf2b1d (patch) | |
| tree | 2af317fda58a7b406f29c35d4032dd436f51d8bb /block/vhdx.c | |
| parent | 3f910692c287e1c611c00e763ebeb95ed0e017f8 (diff) | |
block/vhdx: check for offset overflow to bdrv_truncate()
VHDX uses uint64_t types for most offsets, following the VHDX spec.
However, bdrv_truncate() takes an int64_t value for the truncating
offset. Check for overflow before calling bdrv_truncate().
While we are here, replace the bit shifting with QEMU_ALIGN_UP as well.
N.B.: For a compliant image this is not an issue, as the maximum VHDX
image size is defined per the spec to be 64TB.
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/vhdx.c')
| -rw-r--r-- | block/vhdx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/vhdx.c b/block/vhdx.c index 37224b8858..7ae4589879 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1177,6 +1177,9 @@ static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s, /* per the spec, the address for a block is in units of 1MB */ *new_offset = ROUND_UP(*new_offset, 1024 * 1024); + if (*new_offset > INT64_MAX) { + return -EINVAL; + } return bdrv_truncate(bs->file, *new_offset + s->block_size, PREALLOC_MODE_OFF, NULL); |