linux-kernel - Re: [PATCH net,v3] net/smc: prevent NULL pointer dereference in txopt

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Message-Id: <20240814035812.220388-1-aha310510@gmail.com>
Date: Wed, 14 Aug 2024 12:58:12 +0900
From: Jeongjun Park <aha310510@...il.com>
To: alibuda@...ux.alibaba.com
Cc: aha310510@...il.com,
	davem@...emloft.net,
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Subject: Re: [PATCH net,v3] net/smc: prevent NULL pointer dereference in txopt_get

Because clcsk_*, like clcsock, is initialized during the smc init process, 
the code was moved to prevent clcsk_* from having an address like 
inet_sk(sk)->pinet6, thereby preventing the previously initialized values 
from being tampered with.

Additionally, if you don't need alignment in smc_inet6_prot , I'll modify 
the patch to only add the necessary code without alignment.

Regards,
Jeongjun Park

>
>
> >
> > Also, regarding alignment, it's okay for me whether it's aligned or
> > not，But I checked the styles of other types of
> > structures and did not strictly require alignment, so I now feel that
> > there is no need to
> > modify so much to do alignment.
> >
> > D. Wythe
>
>
>
> >
> >>
> >>>> +
> >>>>    static struct proto smc_inet6_prot = {
> >>>> -     .name           = "INET6_SMC",
> >>>> -     .owner          = THIS_MODULE,
> >>>> -     .init           = smc_inet_init_sock,
> >>>> -     .hash           = smc_hash_sk,
> >>>> -     .unhash         = smc_unhash_sk,
> >>>> -     .release_cb     = smc_release_cb,
> >>>> -     .obj_size       = sizeof(struct smc_sock),
> >>>> -     .h.smc_hash     = &smc_v6_hashinfo,
> >>>> -     .slab_flags     = SLAB_TYPESAFE_BY_RCU,
> >>>> +     .name                           = "INET6_SMC",
> >>>> +     .owner                          = THIS_MODULE,
> >>>> +     .init                           = smc_inet_init_sock,
> >>>> +     .hash                           = smc_hash_sk,
> >>>> +     .unhash                         = smc_unhash_sk,
> >>>> +     .release_cb                     = smc_release_cb,
> >>>> +     .obj_size                       = sizeof(struct smc6_sock),
> >>>> +     .h.smc_hash                     = &smc_v6_hashinfo,
> >>>> +     .slab_flags                     = SLAB_TYPESAFE_BY_RCU,
> >>>> +     .ipv6_pinfo_offset              = offsetof(struct smc6_sock,
> >>>> np),
> >>>>    };
> >>>>
> >>>>    static const struct proto_ops smc_inet6_stream_ops = {
> >>>> --
> >
>