libbpf: Fix uninitialized variable in btf_parse_type_sec

Fix obvious unitialized variable use that wasn't reported by compiler. libbpf
Makefile changes to catch such errors are added separately.

Fixes: 3289959b97ca ("libbpf: Support BTF loading and raw data output in both endianness")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200929220604.833631-1-andriin@fb.com

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index e1dbd76..398b1f3 100644 (file)
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -347,7 +347,7 @@ static int btf_parse_type_sec(struct btf *btf)
        struct btf_header *hdr = btf->hdr;
        void *next_type = btf->types_data;
        void *end_type = next_type + hdr->type_len;
-       int err, i, type_size;
+       int err, i = 0, type_size;
 
        /* VOID (type_id == 0) is specially handled by btf__get_type_by_id(),
         * so ensure we can never properly use its offset from index by