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 3A6CD4C6A for ; Mon, 14 Nov 2022 12:53:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91E59C433C1; Mon, 14 Nov 2022 12:53:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1668430393; bh=Ly+hfsmqW4gTBmrAeDRosqyezblJNYg50rMWCAr8GKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fwjt7HiiQA1QSuZPEUG7IylNcnFUzULuZWp2P0eDCTu+V6i+1KAPW/9k9qQGZLvKz NMVFdqmH1jSOrJdXnpelN4c2ODb7D0Kcx8Wh6kQXSqsQm/8WjUifFVjQVDgQRnyRb9 0GIDkR6KzsXRyNBPjZfwkIObTt7otXoqAm+E7YXA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pu Lehui , Daniel Borkmann , Quentin Monnet , Sasha Levin Subject: [PATCH 5.15 016/131] bpftool: Fix NULL pointer dereference when pin {PROG, MAP, LINK} without FILE Date: Mon, 14 Nov 2022 13:44:45 +0100 Message-Id: <20221114124449.413801264@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221114124448.729235104@linuxfoundation.org> References: <20221114124448.729235104@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: Pu Lehui [ Upstream commit 34de8e6e0e1f66e431abf4123934a2581cb5f133 ] When using bpftool to pin {PROG, MAP, LINK} without FILE, segmentation fault will occur. The reson is that the lack of FILE will cause strlen to trigger NULL pointer dereference. The corresponding stacktrace is shown below: do_pin do_pin_any do_pin_fd mount_bpffs_for_pin strlen(name) <- NULL pointer dereference Fix it by adding validation to the common process. Fixes: 75a1e792c335 ("tools: bpftool: Allow all prog/map handles for pinning objects") Signed-off-by: Pu Lehui Signed-off-by: Daniel Borkmann Reviewed-by: Quentin Monnet Link: https://lore.kernel.org/bpf/20221102084034.3342995-1-pulehui@huaweicloud.com Signed-off-by: Sasha Levin --- tools/bpf/bpftool/common.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index d42d930a3ec4..e4c65d34fe74 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -278,6 +278,9 @@ int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) int err; int fd; + if (!REQ_ARGS(3)) + return -EINVAL; + fd = get_fd(&argc, &argv); if (fd < 0) return fd; -- 2.35.1