From e0eef12a1f46bf946e24050a1da0f067c3952b89 Mon Sep 17 00:00:00 2001
From: Kavin Gunasekara <kavin.gunasekara@arm.com>
Date: Mon, 9 Mar 2026 16:55:05 +0000
Subject: [PATCH] virtio: rng: Handle oversized return buffers

If extra random bytes are returned, truncate and use the requested number
instead of returning an error.

Signed-off-by: Kavin Gunasekara <kavin.gunasekara@arm.com>
Signed-off-by: Meet Patel <meet.patel2@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/virtio/virtio_rng.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_rng.c b/drivers/virtio/virtio_rng.c
index 90a371a59cc..c6de62142bb 100644
--- a/drivers/virtio/virtio_rng.c
+++ b/drivers/virtio/virtio_rng.c
@@ -46,7 +46,7 @@ static int virtio_rng_read(struct udevice *dev, void *data, size_t len)
 			;
 
 		if (rsize > sg.length)
-			return -EIO;
+			rsize = sg.length;
 
 		memcpy(ptr, buf, rsize);
 		len -= rsize;