[PATCH v2] KVM: PPC: Fix callback check in kvmppc_gsm_refresh_info

[Bui Nguyen Nhu Quynh]

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 <kaylovefoss@xxxxxxxxx>
---
v2:
- Resend; v1 was mangled by the mail client. No code changes.

 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