linux-kernel - Re: [PATCH] kexec: Fix uninitialized struct kimage *image pointer

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Message-ID: <aT9h54lX3J+cO0gf@MiWiFi-R3L-srv>
Date: Mon, 15 Dec 2025 09:18:31 +0800
From: Baoquan He <bhe@...hat.com>
To: Qiang Ma <maqianga@...ontech.com>
Cc: akpm@...ux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kexec: Fix uninitialized struct kimage *image pointer

On 12/14/25 at 07:35pm, Qiang Ma wrote:
> 
> 在 2025/12/12 18:53, Baoquan He 写道:
> > On 12/12/25 at 03:16pm, Qiang Ma wrote:
> > > The image is initialized to NULL. Then, after calling kimage_alloc_init,
> > > we can directly goto 'out' because at this time, the kimage_free will
> > > determine whether image is a NULL pointer.
> > Rechecked the code flow, in kimage_alloc_init(), if anything wrong, the
> > allocated memory are all freed via out_free_control_pages and
> > out_free_image accordingly, any place missed? If no, I think the current
> > code is correctly handled.
> I rechecked the code and found no omissions.

Hmm, my bad, I didn't say my question clearly. I checked code, didn't
find anything wrong in the current code. In kimage_alloc_init(), the
allocated memory are all freed on failure, no memory leaked. Means you
are fixing correct code.

> > > Signed-off-by: Qiang Ma <maqianga@...ontech.com>
> > > ---
> > >   kernel/kexec.c | 4 +++-
> > >   1 file changed, 3 insertions(+), 1 deletion(-)
> > Acked-by: Baoquan He <bhe@...hat.com>
> > 
> > > diff --git a/kernel/kexec.c b/kernel/kexec.c
> > > index 28008e3d462e..9bb1f2b6b268 100644
> > > --- a/kernel/kexec.c
> > > +++ b/kernel/kexec.c
> > > @@ -95,6 +95,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
> > >   	unsigned long i;
> > >   	int ret;
> > > +	image = NULL;
> > > +
> > >   	/*
> > >   	 * Because we write directly to the reserved memory region when loading
> > >   	 * crash kernels we need a serialization here to prevent multiple crash
> > > @@ -129,7 +131,7 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
> > >   	ret = kimage_alloc_init(&image, entry, nr_segments, segments, flags);
> > >   	if (ret)
> > > -		goto out_unlock;
> > > +		goto out;
> > >   	if (flags & KEXEC_PRESERVE_CONTEXT)
> > >   		image->preserve_context = 1;
> > > -- 
> > > 2.20.1
> > > 
> > 
>