Re: [PATCH v2 06/15] block: Fix crash on block_resize on inactive node

[Eric Blake]

On Thu, Jan 30, 2025 at 06:12:37PM +0100, Kevin Wolf wrote:
> In order for block_resize to fail gracefully on an inactive node instead
> of crashing with an assertion failure in bdrv_co_write_req_prepare()
> (called from bdrv_co_truncate()), we need to check for inactive nodes
> also when they are attached as a root node and make sure that
> BLK_PERM_RESIZE isn't among the permissions allowed for inactive nodes.
> To this effect, don't enumerate the permissions that are incompatible
> with inactive nodes any more, but allow only BLK_PERM_CONSISTENT_READ
> for them.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  block.c               | 7 +++++++
>  block/block-backend.c | 2 +-
>  2 files changed, 8 insertions(+), 1 deletion(-)

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org