From 6dcdd1b68b7f9333d48d48fc77b75e7f235f6a4a Mon Sep 17 00:00:00 2001
From: Pu Lehui <pulehui@huawei.com>
Date: Wed, 2 Nov 2022 16:40:34 +0800
Subject: [PATCH] bpftool: Fix NULL pointer dereference when pin {PROG, MAP,
LINK} without FILE
[ 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 <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20221102084034.3342995-1-pulehui@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 d42d930a3ec4d..e4c65d34fe74f 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;
--
2.30.2