netdev - [PATCH v2] tools/libbpf: signedness bug in btf_dedup_ref

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Date:   Thu, 28 Feb 2019 20:50:35 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2] tools/libbpf: signedness bug in btf_dedup_ref_type()

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 <dan.carpenter@...cle.com>
Acked-by: Andrii Nakryiko <andriin@...com>
---
v2: Use reverse Christmas tree style

This goes through the BPF tree probably, although it does apply to
net-next.

 drivers/infiniband/ulp/iser/iscsi_iser.h | 2 +-
 tools/lib/bpf/btf.c                      | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 120b40829560..ee7d3f6a666e 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -197,7 +197,7 @@ struct iser_data_buf {
 	struct scatterlist *sg;
 	int                size;
 	unsigned long      data_len;
-	unsigned int       dma_nents;
+	int		   dma_nents;
 };
 
 /* fwd declarations */
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