[PATCH v9 6/6] KVM: arm64: Zero out the stack initialized data in the FFA handler

[Sebastian Ene]

Don't leak hypervisor stack data when using the FFA_VERSION call.
When the compiler doesn't support -ftrivial-auto-var-init=zero option
we need to zero out the stack initialized variable before returning data
to the host caller.

Closes:
https://lore.kernel.org/all/20260616160016.C62C81F000E9@smtp.kernel.org/

Reported-by: Sashiko AI <sashiko-bot at kernel.org>
Fixes: c9c012625e12 ("KVM: arm64: Trap FFA_VERSION host call in pKVM")
Reviewed-by: Vincent Donnefort <vdonnefort at google.com>
Link: https://lore.kernel.org/all/20260616160016.C62C81F000E9@smtp.kernel.org/
Signed-off-by: Sebastian Ene <sebastianene at google.com>
---
 arch/arm64/kvm/hyp/nvhe/ffa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index 9c96e72e522e..a327c2bbb6b6 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
@@ -880,7 +880,7 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs *res,
 
 bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
 {
-	struct arm_smccc_1_2_regs res;
+	struct arm_smccc_1_2_regs res = {0};
 
 	/*
 	 * There's no way we can tell what a non-standard SMC call might
-- 
2.55.0.rc0.799.gd6f94ed593-goog