Re: [Xen-devel] [Qemu-devel] [PATCH] xen-disk: use g_malloc0 to fix build

[Eric Blake <eblake@xxxxxxxxxx>]

On 07/28/2017 07:48 AM, Olaf Hering wrote:
> On Fri, Jul 28, Eric Blake wrote:
> 
>> This version is prone to multiplication overflow (well, maybe not, but
>> you have to audit for that).  Wouldn't it be better to use:
> 
> What could go wrong?
> qemu will die either way, I think.

Dying immediately due to provable multiplication overflow is MUCH better
than successfully allocating too-little and then having who-knows-what
go wrong down the road because you didn't check for overflow.  The
latter can sometimes be exploited into CVEs.  And maybe you can't
overflow, but having to do a non-local audit to prove that is more time
spent than just using the right interface from the get-go.

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

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