Re: [Qemu-stable] [Qemu-devel] [PATCH 2/3] qemu-img: Use only string options in img_open_opts

[Eric Blake]

On 05/02/2018 03:20 PM, Max Reitz wrote:
> img_open_opts() takes a QemuOpts and converts them to a QDict, so all
> values therein are strings.  Then it may try to call qdict_get_bool(),
> however, which will fail with a segmentation fault every time:

I have no idea if it's worth fixing qdict_get_bool() to at least not 
segfault when called on a non-bool Dict member (but what should it 
return, true or false? or should it abort() for at least a cleaner 
failure than a segfault?)

But in the meantime, your fix is correct.

> $ ./qemu-img info -U --image-opts \
>      driver=file,filename=/dev/null,force-share=off
> [1]    27869 segmentation fault (core dumped)  ./qemu-img info -U
> --image-opts driver=file,filename=/dev/null,force-share=off
>
> Fix this by using qdict_get_str() and comparing the value as a string.
> Also, when adding a force-share value to the QDict, add it as a string
> so it fits the rest of the dict.
>
> Cc: address@hidden
> Signed-off-by: Max Reitz <address@hidden>
> ---
>   qemu-img.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org