From: Qing Wang <wangqing@vivo.com>
To: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Qing Wang <wangqing@vivo.com>
Subject: [PATCH V2] net: bpf: switch over to memdup_user()
Date: Mon, 18 Oct 2021 04:30:48 -0700 [thread overview]
Message-ID: <1634556651-38702-1-git-send-email-wangqing@vivo.com> (raw)
This patch fixes the following Coccinelle warning:
net/bpf/test_run.c:361:8-15: WARNING opportunity for memdup_user
net/bpf/test_run.c:1055:8-15: WARNING opportunity for memdup_user
Use memdup_user rather than duplicating its implementation
This is a little bit restricted to reduce false positives
Signed-off-by: Qing Wang <wangqing@vivo.com>
---
net/bpf/test_run.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 5296087..fbda8f5
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -358,13 +358,9 @@ int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
return -EINVAL;
if (ctx_size_in) {
- info.ctx = kzalloc(ctx_size_in, GFP_USER);
- if (!info.ctx)
- return -ENOMEM;
- if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) {
- err = -EFAULT;
- goto out;
- }
+ info.ctx = memdup_user(ctx_in, ctx_size_in);
+ if (IS_ERR(info.ctx))
+ return PTR_ERR(info.ctx);
} else {
info.ctx = NULL;
}
@@ -392,7 +388,6 @@ int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
err = -EFAULT;
-out:
kfree(info.ctx);
return err;
}
@@ -1052,13 +1047,9 @@ int bpf_prog_test_run_syscall(struct bpf_prog *prog,
return -EINVAL;
if (ctx_size_in) {
- ctx = kzalloc(ctx_size_in, GFP_USER);
- if (!ctx)
- return -ENOMEM;
- if (copy_from_user(ctx, ctx_in, ctx_size_in)) {
- err = -EFAULT;
- goto out;
- }
+ ctx = memdup_user(ctx_in, ctx_size_in);
+ if (IS_ERR(ctx))
+ return PTR_ERR(ctx);
}
rcu_read_lock_trace();
--
2.7.4
next reply other threads:[~2021-10-18 11:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-18 11:30 Qing Wang [this message]
2021-10-18 16:26 ` [PATCH V2] net: bpf: switch over to memdup_user() John Fastabend
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