linux-kernel - [PATCH -next] libbpf: Add additional null-pointer checking in make_parent

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220421130056.2510372-1-cuigaosheng1@huawei.com>
Date:   Thu, 21 Apr 2022 21:00:56 +0800
From:   Gaosheng Cui <cuigaosheng1@...wei.com>
To:     <cuigaosheng1@...wei.com>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andrii@...nel.org>, <kafai@...com>,
        <songliubraving@...com>, <yhs@...com>, <john.fastabend@...il.com>,
        <kpsingh@...nel.org>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <gongruiqi1@...wei.com>,
        <wangweiyang2@...wei.com>
Subject: [PATCH -next] libbpf: Add additional null-pointer checking in make_parent_dir

The make_parent_dir is called without null-pointer checking for path,
such as bpf_link__pin. To ensure there is no null-pointer dereference
in make_parent_dir, so make_parent_dir requires additional null-pointer
checking for path.

Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
---
 tools/lib/bpf/libbpf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index b53e51884f9e..5786e6184bf5 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -7634,6 +7634,9 @@ static int make_parent_dir(const char *path)
 	char *dname, *dir;
 	int err = 0;
 
+	if (path == NULL)
+		return -EINVAL;
+
 	dname = strdup(path);
 	if (dname == NULL)
 		return -ENOMEM;
-- 
2.25.1