linux-kernel - Re: [PATCH-next] i3c: master: Fix potentially uninit variable

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Message-ID: <CAJ7bepJ9vd8s4Yd+HpvGyZG3PE8oK8YPMFxtkPRO-W-t-Pe63Q@mail.gmail.com>
Date: Wed, 27 Nov 2024 01:26:08 +0530
From: Advait Dhamorikar <advaitdhamorikar@...il.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH-next] i3c: master: Fix potentially uninit variable

Hello,

I would really appreciate it if I could get some feedback on this patch,
I would like to know if this approach is the right way to proceed.

Thanks and regards,
Advait

On Tue, 19 Nov 2024 at 21:09, Advait Dhamorikar
<advaitdhamorikar@...il.com> wrote:
>
> devinfo is uninitialized if the condition is not satisfied,
> add an else condition to prevent unexpected behaviour.
>
> The variable will contain an arbitrary value left from earlier
> computations in `i3c_device_uevent`.
>
> Signed-off-by: Advait Dhamorikar <advaitdhamorikar@...il.com>
> ---
>  drivers/i3c/master.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 42310c9a00c2..7594d3793eb0 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -284,6 +284,8 @@ static int i3c_device_uevent(const struct device *dev, struct kobj_uevent_env *e
>
>         if (i3cdev->desc)
>                 devinfo = i3cdev->desc->info;
> +       else
> +               return -ENODEV;
>         manuf = I3C_PID_MANUF_ID(devinfo.pid);
>         part = I3C_PID_PART_ID(devinfo.pid);
>         ext = I3C_PID_EXTRA_INFO(devinfo.pid);
> --
> 2.34.1
>