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block/vpc: check that the image has not been truncated

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this adds a check that a dynamic VHD file has not been
accidently truncated (e.g. during transfer or upload).

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven 2013-10-24 09:16:03 +02:00 • committed by Kevin Wolf
parent fefddf951b
commit fb8fe35f63
1 changed files with 7 additions and 0 deletions
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7
block/vpc.c
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@ -260,6 +260,13 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
} }
} }
if (s->free_data_block_offset > bdrv_getlength(bs->file)) {
error_setg(errp, "block-vpc: free_data_block_offset points after "
"the end of file. The image has been truncated.");
ret = -EINVAL;
goto fail;
}
s->last_bitmap_offset = (int64_t) -1; s->last_bitmap_offset = (int64_t) -1;
#ifdef CACHE #ifdef CACHE