netdev - [PATCH v2 bpf-next 3/3] libbpf: propagate errors when retrieving enum value for typed data display

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Date:   Tue, 20 Jul 2021 09:49:53 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, morbo@...gle.com,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH v2 bpf-next 3/3] libbpf: propagate errors when retrieving enum value for typed data display

When retrieving the enum value associated with typed data during
"is data zero?" checking in btf_dump_type_data_check_zero(), the
return value of btf_dump_get_enum_value() is not passed to the caller
if the function returns a non-zero (error) value.  Currently, 0
is returned if the function returns an error.  We should instead
propagate the error to the caller.

Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
---
 tools/lib/bpf/btf_dump.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index d52e546..e4b483f 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -2166,8 +2166,9 @@ static int btf_dump_type_data_check_zero(struct btf_dump *d,
 		return -ENODATA;
 	}
 	case BTF_KIND_ENUM:
-		if (btf_dump_get_enum_value(d, t, data, id, &value))
-			return 0;
+		err = btf_dump_get_enum_value(d, t, data, id, &value);
+		if (err)
+			return err;
 		if (value == 0)
 			return -ENODATA;
 		return 0;
-- 
1.8.3.1