From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFBCB1ED41 for ; Fri, 21 Jul 2023 18:53:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72880C433C7; Fri, 21 Jul 2023 18:53:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689965632; bh=++ns4nNs+c9ftg6r8Za2ltsHbM0UrYXOwk+dDjMLysQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gJY6TpQa4uinSmPsa/mVET1st3nXLSX04wa12ZsaYHDrPwcqauzj1PFIC21bW/OFW KJuQTREFlyNi2PIY5ULLs2Hzf2LtydtvcrGYRFdUnvAPHLJ+tiWIQPc7jLe26O7cSX GY8pdGydfpEcVYspi5VWBK+T9CUemyH/D6vtzxK4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Jesper Dangaard Brouer , Daniel Borkmann , Simon Horman , Sasha Levin Subject: [PATCH 5.15 059/532] selftests/bpf: Fix check_mtu using wrong variable type Date: Fri, 21 Jul 2023 17:59:23 +0200 Message-ID: <20230721160617.838322213@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230721160614.695323302@linuxfoundation.org> References: <20230721160614.695323302@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jesper Dangaard Brouer [ 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 Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann Reviewed-by: Simon Horman Link: https://lore.kernel.org/bpf/168605104733.3636467.17945947801753092590.stgit@firesoul Signed-off-by: Sasha Levin --- tools/testing/selftests/bpf/prog_tests/check_mtu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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(); -- 2.39.2