diff mbox series

libbpf: Change hash_combine parameters from long to unsigned long

Message ID 20241116081054.65195-1-sidong.yang@furiosa.ai (mailing list archive)
State Accepted
Commit 2c8b09ac2537299511c898bc71b1a5f2756c831c
Delegated to: BPF
Headers show
Series libbpf: Change hash_combine parameters from long to unsigned long | expand

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Context Check Description
netdev/tree_selection success Not a local patch
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Commit Message

Sidong Yang Nov. 16, 2024, 8:10 a.m. UTC 
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@furiosa.ai>
---
 tools/lib/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Yonghong Song Nov. 16, 2024, 6:54 p.m. UTC | #1 
On 11/16/24 12:10 AM, Sidong Yang wrote:
> 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@furiosa.ai>

Acked-by: Yonghong Song <yonghong.song@linux.dev>
patchwork-bot+netdevbpf@kernel.org Nov. 16, 2024, 7:10 p.m. UTC | #2 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Sat, 16 Nov 2024 17:10:52 +0900 you wrote:
> 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@furiosa.ai>
> ---
>  tools/lib/bpf/btf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Here is the summary with links:
  - libbpf: Change hash_combine parameters from long to unsigned long
    https://git.kernel.org/bpf/bpf-next/c/2c8b09ac2537

You are awesome, thank you!
diff mbox series

Patch

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;
 }