[PATCH] KVM: arm64: Add memory length checks before it is xfered
Snehal Koukuntla
snehalreddy at google.com
Fri Sep 6 02:27:32 PDT 2024
From: Snehal <snehalreddy at google.com>
Check size during allocation to fix discrepancy in memory reclaim path.
Currently only happens during memory reclaim, inconsistent with mem_xfer
Signed-off-by: Snehal Koukuntla <snehalreddy at google.com>
---
arch/arm64/kvm/hyp/nvhe/ffa.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index e715c157c2c4..e9223cc4f913 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
@@ -461,6 +461,11 @@ static __always_inline void do_ffa_mem_xfer(const u64 func_id,
goto out_unlock;
}
+ if (len > ffa_desc_buf.len) {
+ ret = FFA_RET_NO_MEMORY;
+ goto out_unlock;
+ }
+
buf = hyp_buffers.tx;
memcpy(buf, host_buffers.tx, fraglen);
--
2.46.0.469.g59c65b2a67-goog
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