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From:   YueHaibing <yuehaibing@huawei.com>
To:     <ast@kernel.org>, <daniel@iogearbox.net>, <kafai@fb.com>,
        <songliubraving@fb.com>, <yhs@fb.com>, <andriin@fb.com>,
        <john.fastabend@gmail.com>, <kpsingh@chromium.org>,
        <quentin@isovalent.com>
CC:     <netdev@vger.kernel.org>, <bpf@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH v2] tools/bpftool: Fix error handing in do_skeleton()
Date:   Fri, 17 Jul 2020 20:30:59 +0800
Message-ID: <20200717123059.29624-1-yuehaibing@huawei.com>
In-Reply-To: <20200715031353.14692-1-yuehaibing@huawei.com>
References: <20200715031353.14692-1-yuehaibing@huawei.com>
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Fix pass 0 to PTR_ERR, also dump more err info using
libbpf_strerror.

Fixes: 5dc7a8b21144 ("bpftool, selftests/bpf: Embed object file inside skeleton")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
---
v2: use libbpf_strerror
---
 tools/bpf/bpftool/gen.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index b59d26e89367..8a4c2b3b0cd6 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -302,8 +302,11 @@ static int do_skeleton(int argc, char **argv)
 	opts.object_name = obj_name;
 	obj = bpf_object__open_mem(obj_data, file_sz, &opts);
 	if (IS_ERR(obj)) {
+		char err_buf[256];
+
+		libbpf_strerror(PTR_ERR(obj), err_buf, sizeof(err_buf));
+		p_err("failed to open BPF object file: %s", err_buf);
 		obj = NULL;
-		p_err("failed to open BPF object file: %ld", PTR_ERR(obj));
 		goto out;
 	}
 
-- 
2.17.1