Commit ca318e7bbb77 for kernel

commit ca318e7bbb7723f57bcd9e69a2873b5884435552
Author: Gang Yan <yangang@kylinos.cn>
Date:   Mon Aug 3 18:16:37 2026 +0200

    selftests: mptcp: join: mark tests with data corruption as failed

    check_transfer() compares the input and output files byte-by-byte using
    `cmp -l "$in" "$out" | while read ...`. Because the while-loop body runs
    in a subshell (the script sets neither lastpipe nor pipefail), the
    fail_test call inside it -- which sets the global ret/last_test_failed --
    and the `return 1` both act on the subshell, not on check_transfer().

    check_transfer() thus always falls through to `return 0`, and any data
    corruption affecting only the payload (leaving the subflow/PM counters
    untouched) is silently reported as PASS.

    Fixes: 8117dac3e7c3 ("selftests: mptcp: add invert check in check_transfer")
    Cc: stable@vger.kernel.org
    Signed-off-by: Gang Yan <yangang@kylinos.cn>
    Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Link: https://patch.msgid.link/20260803-net-mptcp-misc-fixes-7-2-rc6-v2-5-b8f496d71664@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index c0aeffd5cb71..7dc91fac4917 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -584,7 +584,7 @@ check_transfer()
 		mv "$tmpfile" "$out"
 		tmpfile=""
 	fi
-	cmp -l "$in" "$out" | while read -r i a b; do
+	while read -r i a b; do
 		local sum=$((0${a} + 0${b}))
 		if [ $check_invert -eq 0 ] || [ $sum -ne $((0xff)) ]; then
 			fail_test "$what does not match (in, out):"
@@ -595,7 +595,7 @@ check_transfer()
 		else
 			print_info "$what has inverted byte at ${i}"
 		fi
-	done
+	done < <(cmp -l "$in" "$out")

 	return 0
 }