netdev - Re: [PATCH] hooks: fix a missing-check bug in selinux_add_mnt

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Message-ID: <20190530091848.GA3499@zhanggen-UX430UQ>
Date:   Thu, 30 May 2019 17:18:48 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     paul@...l-moore.com, sds@...ho.nsa.gov, eparis@...isplace.org,
        ccross@...roid.com, selinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] hooks: fix a missing-check bug in selinux_add_mnt_opt()

On Thu, May 30, 2019 at 12:11:33PM +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 30.05.2019 11:06, Gen Zhang wrote:
> 
> >In selinux_add_mnt_opt(), 'val' is allcoted by kmemdup_nul(). It returns
> 
>    Allocated?
Thanks for your reply, Sergei. I used 'allocated' because kmemdup_nul()
does some allocation in its implementation. And its docs descrips: 
"Return: newly allocated copy of @s with NUL-termination or %NULL in 
case of error". I think it is proper to use 'allocated' here. But it 
could be 'assigned', which is better, right?

Thanks
Gen
> 
> >NULL when fails. So 'val' should be checked.
> >
> >Signed-off-by: Gen Zhang <blackgod016574@...il.com>
> [...]
> 
> MBR, Sergei