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

[Qiang Ma]

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.
> > Signed-off-by: Qiang Ma <maqianga@xxxxxxxxxxxxx>
> > ---
> >   kernel/kexec.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> Acked-by: Baoquan He <bhe@xxxxxxxxxx>
>
> > 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