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Re: [PATCH] xenpm: sanitize allocations in show_cpufreq_para_by_cpuid()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 25 Mar 2025 15:30:35 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jason Andryuk <jandryuk@xxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 25 Mar 2025 14:30:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.03.2025 15:20, Andrew Cooper wrote:
> On 25/03/2025 12:51 pm, Jan Beulich wrote:
>> malloc(), when passed zero size, may return NULL (the behavior is
>> implementation defined).
>
> More importantly, this is the Musl behaviour, so is how ~most of Gitlab
> CI behaves.
>
>> Extend the ->gov_num check to the other two
>> allocations as well.
>
> I'm not sure what you mean by this. Only one of these hunks has a
> ->gov_num check.
Not sure I see a better way of wording this: What I mean to say is that
the ->gov_num check that there is already is being replicated (with "gov"
replaced accordingly) to the other two places where similar allocations
happen. Maybe simply s/Extend/Mirror" would already help?
>> Don't chance then actually using a NULL in
>> print_cpufreq_para().
>>
>> Fixes: 75e06d089d48 ("xenpm: add cpu frequency control interface, through
>> which user can")
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> The code change looks ok, so Acked-by: Andrew Cooper
> <andrew.cooper3@xxxxxxxxxx> but I'd prefer a clarified commit message.
Thanks.
Jan
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