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Re: [PATCH] async: Suppress GCC13 false positive in aio_bh_poll()


From: Paolo Bonzini
Subject: Re: [PATCH] async: Suppress GCC13 false positive in aio_bh_poll()
Date: Fri, 28 Apr 2023 16:26:01 +0200



Il mar 25 apr 2023, 15:31 Daniel P. Berrangé <berrange@redhat.com> ha scritto:
> > -    BHListSlice slice;
> > +    /*
> > +     * gcc13 complains about putting a local variable
> > +     * in a global list, so put it on the heap.
> > +     */
> > +    g_autofree BHListSlice *slice = g_new(BHListSlice, 1);
> >      BHListSlice *s;
> >      int ret = 0;
> > 
>
> This must be a memory leak since you're adding a g_new but not
> adding any g_free

Sorry, I'm failing to read properly today. It uses g_autofree
so there is no leak.

On the other hand, if the pointer to the heap-allocated BHListSlice escaped, this would be a dangling pointer as well—just not the kind that the new GCC warning can report.

So this patch is also doing nothing but shut up the compiler; but it's doing so in an underhanded manner and with a runtime cost, and as such it's worse than Cedric's patch.

Paolo


With regards,
Daniel
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