Re: [PATCH] eal: fix out of bound access when no cpu is available

[Thomas Monjalon <thomas@monjalon.net>]

17/01/2019 18:17, David Marchand:
> On Thu, Jan 17, 2019 at 5:34 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> 
> > 17/01/2019 14:12, David Marchand:
> > > In the unlikely case when the dpdk application is started with no cpu
> > > available in the [0, RTE_MAX_LCORE - 1] range, the master_lcore is
> > > automatically chosen as RTE_MAX_LCORE which triggers an out of bound
> > > access.
> > >
> > > Either you have a crash then, or the initialisation fails later when
> > > trying to pin the master thread on it.
> > > In my test, with RTE_MAX_LCORE == 2:
> > >
> > > $ taskset -c 2 ./master/app/testpmd --no-huge -m 512 --log-level *:debug
> > > [...]
> > > EAL: pthread_setaffinity_np failed
> > > PANIC in eal_thread_init_master():
> > > cannot set affinity
> > > 7: [./master/app/testpmd() [0x47f629]]
> > >
> > > Bugzilla ID: 19
> > > Signed-off-by: David Marchand <david.marchand@redhat.com>
> >
> > We should backport this fix.
> > When this bug has been introduced?
> >
> 
> Indeed, at first, I thought the problem had always been there, but it
> should be starting 17.02:
> Fixes: 2eba8d21f3c9 ("eal: restrict cores auto detection")
> 
> + CC stable
> 
> Do you want a v2 ?

Applied, thanks