[PATCH v3] tools/libbpf: signedness bug in btf_dedup_ref_type()
From: Dan Carpenter <hidden>
Date: 2019-02-28 18:07:25
Also in:
bpf, kernel-janitors
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
The "ref_type_id" variable needs to be signed for the error handling
to work.
Fixes: d5caef5b5655 ("btf: add BTF types deduplication algorithm")
Signed-off-by: Dan Carpenter <redacted>
Acked-by: Andrii Nakryiko <redacted>
---
v2: Use reverse Christmas tree style
v3: Remove the bonus fix.
This goes through the BPF tree probably, although it does apply to
net-next.
tools/lib/bpf/btf.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 68b50e9bbde1..00a2f06e38fd 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c@@ -2326,7 +2326,8 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id) struct btf_type *t, *cand; /* if we don't find equivalent type, then we are representative type */ __u32 new_id = type_id; - __u32 h, ref_type_id; + int ref_type_id; + __u32 h; if (d->map[type_id] == BTF_IN_PROGRESS_ID) return -ELOOP;
--
2.17.1