On Fri, Oct 29, 2021 at 06:31:32PM +0200, Philipp Rudo wrote:
> Hi Baoquan,
>
> On Fri, 29 Oct 2021 17:26:35 +0800
> Baoquan He <bhe@xxxxxxxxxx> wrote:
>
> > A memory leak is reported by kmemleak scanning:
...
> > The ipl report buffer is allocated via vmalloc, while has no chance to free
> > if the kexe loading is unloaded. This will cause obvious memory leak
> > when kexec/kdump kernel is reloaded, manually, or triggered, e.g by
> > memory hotplug.
> >
> > Here, add struct kimage_arch to s390 to pass out the ipl report buffer
> > address, and introduce arch dependent function
> > arch_kimage_file_post_load_cleanup() to free it when unloaded.
> >
> > Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
>
> other than a missing
>
> Fixes: 99feaa717e55 ("s390/kexec_file: Create ipl report and pass to
> next kernel")
>
> the patch looks good to me.
>
> Reviewed-by: Philipp Rudo <prudo@xxxxxxxxxx>
...
> > buf.buffer = ipl_report_finish(data->report);
> > buf.bufsz = data->report->size;
> > buf.memsz = buf.bufsz;
> > + image->arch.ipl_buf = buf.buffer;
This seems (still) to be incorrect: ipl_report_finish() may return
-ENOMEN, but there is no error checking anywhere, as far as I can
tell, which would make this:
> > +int arch_kimage_file_post_load_cleanup(struct kimage *image)
> > +{
> > + kvfree(image->arch.ipl_buf);
> > + image->arch.ipl_buf = NULL;
> > +
> > + return kexec_image_post_load_cleanup_default(image);
> > +}
most likely not do what we want. That is: if this code is reached at
all in such a case. I'll check and might add a patch before this to
fix this also.
