Re: [PATCH] KVM: PPC: Fix callback check in kvmppc_gsm_refresh_info

[Gautam Menghani]

On Tue, Sep 01, 2026 at 03:26:56PM +0200, nhuquynh@xxxxxxxxxxxx wrote:
> From 80fd05e6d156d5a90d4908f2498bf6cc7acbdefd Mon Sep 17 00:00:00 2001
> From: Bui Nguyen Nhu Quynh <nhuquynh@xxxxxxxxxxxx>
> Date: Tue, 1 Sep 2026 19:39:49 +0700
> Subject: [PATCH] KVM: PPC: Fix callback check in kvmppc_gsm_refresh_info
> 

This should not be in the patch description.

> The kvmppc_gsm_refresh_info() function incorrectly checks for the
> presence of the fill_info callback instead of refresh_info.
> 
> This can lead to:
> - NULL pointer dereference if refresh_info is NULL but fill_info is present
> - EINVAL return if refresh_info is present but fill_info is NULL
> 
> Fix this by checking the correct callback.
> 
> Fixes: 6ccbbc33f06ad ("KVM: PPC: Add helper library for Guest State Buffers")
> Signed-off-by: Bui Nguyen Nhu Quynh <nhuquynh@xxxxxxxxxxxx>
> ---
> arch/powerpc/kvm/guest-state-buffer.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kvm/guest-state-buffer.c b/arch/powerpc/kvm/guest-state-buffer.c
> index 42843eca6727..aeb586ba4523 100644
> --- a/arch/powerpc/kvm/guest-state-buffer.c
> +++ b/arch/powerpc/kvm/guest-state-buffer.c
> @@ -598,7 +598,7 @@ EXPORT_SYMBOL_GPL(kvmppc_gsm_fill_info);
> int kvmppc_gsm_refresh_info(struct kvmppc_gs_msg *gsm,
>     struct kvmppc_gs_buff *gsb)
> {
> -	if (!gsm->ops->fill_info)
> +	if (!gsm->ops->refresh_info)
> return -EINVAL;
>  
> return gsm->ops->refresh_info(gsm, gsb);
> -- 
> 2.54.0


This patch does not apply

# git apply 20260901_nhuquynh_kvm_ppc_fix_callback_check_in_kvmppc_gsm_refresh_info.mbx --check --verbose
error: corrupt patch at 20260901_nhuquynh_kvm_ppc_fix_callback_check_in_kvmppc_gsm_refresh_info.mbx:30


The change itself is fine, but please fix the above issues and send a
v2. Refer the documentation in case something is not clear -
https://www.kernel.org/doc/html/latest/process/submitting-patches.html

Thanks,
Gautam