Re: [PATCH v2 1/2] s390/kexec: check the return value of ipl_report_finish

[Heiko Carstens]

On Tue, Nov 16, 2021 at 11:25:56AM +0800, Baoquan He wrote:
> In function ipl_report_finish(), it could fail by memory allocation
> failure, so check the return value to handle the case.
> 
> Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
> ---
>  arch/s390/include/asm/ipl.h           | 2 +-
>  arch/s390/kernel/ipl.c                | 6 ++++--
>  arch/s390/kernel/machine_kexec_file.c | 5 ++++-
>  3 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
> index 3f8ee257f9aa..864ab5d2890c 100644
> --- a/arch/s390/include/asm/ipl.h
> +++ b/arch/s390/include/asm/ipl.h
> @@ -122,7 +122,7 @@ struct ipl_report_certificate {
>  
>  struct kexec_buf;
>  struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib);
> -void *ipl_report_finish(struct ipl_report *report);
> +int ipl_report_finish(struct ipl_report *report, void **ipl_buf);
>  int ipl_report_free(struct ipl_report *report);
>  int ipl_report_add_component(struct ipl_report *report, struct kexec_buf *kbuf,
>  			     unsigned char flags, unsigned short cert);
> diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
> index e2cc35775b99..a0af0b23148d 100644
> --- a/arch/s390/kernel/ipl.c
> +++ b/arch/s390/kernel/ipl.c
> @@ -2144,7 +2144,7 @@ struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib)
>  	return report;
>  }
>  
> -void *ipl_report_finish(struct ipl_report *report)
> +int ipl_report_finish(struct ipl_report *report, void **ipl_buf)
>  {
>  	struct ipl_report_certificate *cert;
>  	struct ipl_report_component *comp;
> @@ -2195,7 +2195,9 @@ void *ipl_report_finish(struct ipl_report *report)
>  	}
>  
>  	BUG_ON(ptr > buf + report->size);
> -	return buf;
> +	*ipl_buf = buf;
> +
> +	return 0;

This does not compile:

  CC      arch/s390/kernel/ipl.o
arch/s390/kernel/ipl.c: In function ‘ipl_report_finish’:
arch/s390/kernel/ipl.c:2159:24: warning: returning ‘void *’ from a function with return type ‘int’ makes integer from pointer without a cast [-Wint-conversion]
 2159 |                 return ERR_PTR(-ENOMEM);
      |                        ^~~~~~~~~~~~~~~~

Anyway, before we are going to have more iterations I just applied the
patch below instead before applying your memory leak fix.