[PATCH 5.15 196/731] libbpf: Fix uninitialized warning in btf_dump_dump_type_data

Greg Kroah-Hartman
2022-12-28T14:54:39Z

From: David Michael <fedora.dm0@gmail.com>

[ Upstream commit dfd0afbf151d85411b371e841f62b81ee5d1ca54 ]

GCC 11.3.0 fails to compile btf_dump.c due to the following error,
which seems to originate in btf_dump_struct_data where the returned
value would be uninitialized if btf_vlen returns zero.

btf_dump.c: In function ‘btf_dump_dump_type_data’:
btf_dump.c:2363:12: error: ‘err’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
2363 | if (err < 0)
| ^

Fixes: 920d16af9b42 ("libbpf: BTF dumper support for typed data")
Signed-off-by: David Michael <fedora.dm0@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Alan Maguire <alan.maguire@oracle.com>
Link: https://lore.kernel.org/bpf/87zgcu60hq.fsf@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/lib/bpf/btf_dump.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 9bcd75dc12cc..f620911ad3bb 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -1915,7 +1915,7 @@ static int btf_dump_struct_data(struct btf_dump *d,
{
const struct btf_member *m = btf_members(t);
__u16 n = btf_vlen(t);
- int i, err;
+ int i, err = 0;

/* note that we increment depth before calling btf_dump_print() below;
* this is intentional. btf_dump_data_newline() will not print a
--
2.35.1