linux-kernel - [PATCH] libbpf: Change hash_combine parameters from long to unsigned long

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Message-ID: <20241116081054.65195-1-sidong.yang@furiosa.ai>
Date: Sat, 16 Nov 2024 17:10:52 +0900
From: Sidong Yang <sidong.yang@...iosa.ai>
To: Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Andrii Nakryiko <andrii.nakryiko@...il.com>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Sidong Yang <sidong.yang@...iosa.ai>
Subject: [PATCH] libbpf: Change hash_combine parameters from long to unsigned long

The hash_combine() could be trapped when compiled with sanitizer like "zig cc"
or clang with signed-integer-overflow option. This patch parameters and return
type to unsigned long to remove the potential overflow.

Signed-off-by: Sidong Yang <sidong.yang@...iosa.ai>
---
 tools/lib/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 8befb8103e32..12468ae0d573 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -3548,7 +3548,7 @@ struct btf_dedup {
 	struct strset *strs_set;
 };
 
-static long hash_combine(long h, long value)
+static unsigned long hash_combine(unsigned long h, unsigned long value)
 {
 	return h * 31 + value;
 }
-- 
2.42.0