From 3a9d4501065f5f5eed3aa23a90c5212d29bae21b Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Fri, 17 Jan 2020 11:05:09 +0100
Subject: [PATCH] trace: avoid page fault on client calling subjects

Fixes #3608
---
 repos/base/include/trace_session/client.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/repos/base/include/trace_session/client.h b/repos/base/include/trace_session/client.h
index dc12f3388..8d2ca33c3 100644
--- a/repos/base/include/trace_session/client.h
+++ b/repos/base/include/trace_session/client.h
@@ -81,7 +81,7 @@ struct Genode::Trace::Session_client : Genode::Rpc_client<Genode::Trace::Session
 		{
 			size_t const num_subjects = min(call<Rpc_subjects>(), dst_len);
 
-			memcpy(dst, _argument_buffer.base, dst_len*sizeof(Subject_id));
+			memcpy(dst, _argument_buffer.base, num_subjects*sizeof(Subject_id));
 
 			return num_subjects;
 		}