Re: [Qemu-devel] [PULL 18/18] nbd/client: fix drop_sync [CVE-2017-2630]

[Eric Blake]

On 03/14/2017 11:18 AM, Paolo Bonzini wrote:
> From: Vladimir Sementsov-Ogievskiy <address@hidden>
> 
> Comparison symbol is misused. It may lead to memory corruption.
> Introduced in commit 7d3123e.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> Message-Id: <address@hidden>
> [eblake: add CVE details, update conditional]
> Signed-off-by: Eric Blake <address@hidden>
> Reviewed-by: Marc-André Lureau <address@hidden>

Encoding issues?

> Message-Id: <address@hidden>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  nbd/client.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/nbd/client.c b/nbd/client.c
> index 5c9dee3..3dc2564 100644
> --- a/nbd/client.c
> +++ b/nbd/client.c
> @@ -94,7 +94,7 @@ static ssize_t drop_sync(QIOChannel *ioc, size_t size)
>      char small[1024];
>      char *buffer;
>  
> -    buffer = sizeof(small) < size ? small : g_malloc(MIN(65536, size));
> +    buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
>      while (size > 0) {
>          ssize_t count = read_sync(ioc, buffer, MIN(65536, size));
>  
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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