linux-kernel - RE: [PATCH] hpet: Fix struct

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Date:   Thu, 30 Jan 2020 10:37:07 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Greg KH' <gregkh@...uxfoundation.org>,
        'Eric Biggers' <ebiggers@...nel.org>
CC:     'Tetsuo Handa' <penguin-kernel@...ove.sakura.ne.jp>,
        "'gustavo@...eddedor.com'" <gustavo@...eddedor.com>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] hpet: Fix struct_size() in kzalloc()

> ...
> > > > -	hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs - 1),
> > > > +	hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs),
> > > >  			GFP_KERNEL);
> > > >
> > > >  	if (!hpetp)
> > > > --
> > >
> > > Yep, "char: hpet: Use flexible-array member" started causing random boot
> > > failures on mainline for me.  Tetsuo beat me to sending the fix.
> > >
> > > Only thing I'll add is that GFP_KERNEL can now fit on the previous line.
> >
> > Gustavo already sent a fix for this, I didn't realize it was causing
> > boot problems, I'll forward it on to Linus soon.
> 
> grep -r --include '*.c' 'struct_size.*- 1'
> gives 4 other matches.
> I bet they all have the same bug.
> There might be others that simple pattern doesn't find.

kvm_main.c is ok - although why it reallocates 1 entry smaller on
    delete is any bodies guess.
megaraid_sas_fusion.c is broken, header has seq[1]
   (and lots of __packed).
iavf_virtchnl.c is broken, header has list[1].
ice_sched.c is broken, header has generic[1].

	David

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