[PATCH] KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info()

[PATCH] KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info()

[Christophe JAILLET]

The return value of kvmppc_gse_put_buff_info() is not assigned to 'rc' and
'rc' is uninitialized at this point.
So the error handling can not work.

Assign the expected value to 'rc' to fix the issue.

Fixes: 19d31c5f1157 ("KVM: PPC: Add support for nestedv2 guests")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 arch/powerpc/kvm/book3s_hv_nestedv2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv_nestedv2.c b/arch/powerpc/kvm/book3s_hv_nestedv2.c
index 5378eb40b162..be5f87e69637 100644
--- a/arch/powerpc/kvm/book3s_hv_nestedv2.c
+++ b/arch/powerpc/kvm/book3s_hv_nestedv2.c
@@ -71,8 +71,8 @@ gs_msg_ops_kvmhv_nestedv2_config_fill_info(struct kvmppc_gs_buff *gsb,
 	}
 
 	if (kvmppc_gsm_includes(gsm, KVMPPC_GSID_RUN_OUTPUT)) {
-		kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_OUTPUT,
-					 cfg->vcpu_run_output_cfg);
+		rc = kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_OUTPUT,
+					      cfg->vcpu_run_output_cfg);
 		if (rc < 0)
 			return rc;
 	}
-- 
2.43.0

Re: [PATCH] KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info()

[Vaibhav Jain]

Christophe JAILLET <christophe.jaillet@wanadoo.fr> writes:

<snip>
>  	if (kvmppc_gsm_includes(gsm, KVMPPC_GSID_RUN_OUTPUT)) {
> -		kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_OUTPUT,
> -					 cfg->vcpu_run_output_cfg);
> +		rc = kvmppc_gse_put_buff_info(gsb, KVMPPC_GSID_RUN_OUTPUT,
> +					      cfg->vcpu_run_output_cfg);
>  		if (rc < 0)
>  			return rc;
>  	}
> -- 
Thanks for catching this and the change looks good to me.

Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>

-- 
Cheers
~ Vaibhav

Re: [PATCH] KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info()

[Michael Ellerman]

On Sun, 28 Jan 2024 12:34:25 +0100, Christophe JAILLET wrote:
> The return value of kvmppc_gse_put_buff_info() is not assigned to 'rc' and
> 'rc' is uninitialized at this point.
> So the error handling can not work.
> 
> Assign the expected value to 'rc' to fix the issue.
> 
> 
> [...]

Applied to powerpc/topic/ppc-kvm.

[1/1] KVM: PPC: Book3S HV nestedv2: Fix an error handling path in gs_msg_ops_kvmhv_nestedv2_config_fill_info()
      https://git.kernel.org/powerpc/c/b52e8cd3f835869370f8540f1bc804a47a47f02b

cheers