This is a note to let you know that I've just added the patch titled
selftests/bpf: Fix check_mtu using wrong variable type
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-bpf-fix-check_mtu-using-wrong-variable-typ.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 32ba106c1266e5e75ce453e098a3943749052725
Author: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Date: Tue Jun 6 13:30:47 2023 +0200
selftests/bpf: Fix check_mtu using wrong variable type
[ Upstream commit 095641817e1bf6aa2560e025e47575188ee3edaf ]
Dan Carpenter found via Smatch static checker, that unsigned 'mtu_lo' is
never less than zero.
Variable mtu_lo should have been an 'int', because read_mtu_device_lo()
uses minus as error indications.
Fixes: b62eba563229 ("selftests/bpf: Tests using bpf_check_mtu BPF-helper")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/168605104733.3636467.17945947801753092590.stgit@firesoul
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/bpf/prog_tests/check_mtu.c b/tools/testing/selftests/bpf/prog_tests/check_mtu.c
index 012068f33a0a8..871971cdd7b75 100644
--- a/tools/testing/selftests/bpf/prog_tests/check_mtu.c
+++ b/tools/testing/selftests/bpf/prog_tests/check_mtu.c
@@ -197,7 +197,7 @@ static void test_check_mtu_tc(__u32 mtu, __u32 ifindex)
void test_check_mtu(void)
{
- __u32 mtu_lo;
+ int mtu_lo;
if (test__start_subtest("bpf_check_mtu XDP-attach"))
test_check_mtu_xdp_attach();
