[PATCH mptcp-next 2/2] selftests: mptcp: simult_flows: set EXIT trap earlier

[Gang Yan <gang.yan@linux.dev>]

From: Gang Yan <yangang@kylinos.cn>

Set the EXIT trap for cleanup immediately after creating the temporary
file variables, before the dd commands that fill them and the namespace
init, to ensure cleanup runs on any failure or interruption during the
early setup phase. If either dd fails (e.g. ENOSPC), the temp files
already created are not cleaned up.

Assisted-by: Codex: GLM-5.2
Signed-off-by: Gang Yan <yangang@kylinos.cn>
---
 tools/testing/selftests/net/mptcp/simult_flows.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index 3ea3d1efe32e..b40dea5f9b30 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -62,13 +62,12 @@ setup()
 	sout=$(mktemp)
 	cout=$(mktemp)
 	capout=$(mktemp)
+	trap cleanup EXIT
 	size=$((2 * 2048 * 4096))
 
 	dd if=/dev/zero of=$small bs=4096 count=20 >/dev/null 2>&1
 	dd if=/dev/zero of=$large bs=4096 count=$((size / 4096)) >/dev/null 2>&1
 
-	trap cleanup EXIT
-
 	mptcp_lib_ns_init ns1 ns2 ns3
 
 	if $capture; then
-- 
2.43.0