linux-kernel - Re: [PATCH 2/2] 9p: client_create: init fcall

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Date:   Thu, 29 Sep 2022 16:03:50 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     v9fs-developer@...ts.sourceforge.net, linux_oss@...debyte.com,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH 2/2] 9p: client_create: init fcall_cache earlier

Leon Romanovsky wrote on Thu, Sep 29, 2022 at 08:57:31AM +0300:
> > +	 * followed by data accessed from userspace by read
> > +	 * Note we do not check for failure here because the cache is
> > +	 * optional; warning will be issued on dmesg for failure.
> > +	 */
> > +	clnt->fcall_cache =
> > +		kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
> > +					   0, 0, P9_HDRSZ + 4,
> > +					   clnt->msize - (P9_HDRSZ + 4),
> > +					   NULL);
> > +
> 
> clnt->msize can be changed after call to ->create() if it is larger than clnt->trans_mod->maxsize).

Ugh, that's what I get for doing this in a hurry because you're all
talking about order this order that...

This is absolutely correct, I'm dropping this patch.

--
Dominique