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

[Amit Machhiwal <amachhiw@linux.ibm.com>]

On 2026/09/01 03:26 PM, nhuquynh@tutamail.com wrote:
> From 80fd05e6d156d5a90d4908f2498bf6cc7acbdefd Mon Sep 17 00:00:00 2001
> From: Bui Nguyen Nhu Quynh <nhuquynh@tutamail.com>
> Date: Tue, 1 Sep 2026 19:39:49 +0700
> Subject: [PATCH] KVM: PPC: Fix callback check in kvmppc_gsm_refresh_info
> 
> 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@tutamail.com>
> ---
> 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;

Thanks for catching this.

The patch appears corrupted by your email client (whitespace mangling /
quoted-printable encoding).

❯ git apply ./20260901_nhuquynh_kvm_ppc_fix_callback_check_in_kvmppc_gsm_refresh_info.mbx
error: corrupt patch at line 30

Please consider configuring and using git send-email to submit v2.

Thanks,
Amit

>  
> return gsm->ops->refresh_info(gsm, gsb);
> -- 
> 2.54.0