Merge v6.12.35linux-rolling-lts

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 23 insertions, 1 deletions

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 27e7bfae953b..b770702dab37 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -995,7 +995,7 @@ static struct btf *btf_new_empty(struct btf *base_btf)
 	if (base_btf) {
 		btf->base_btf = base_btf;
 		btf->start_id = btf__type_cnt(base_btf);
-		btf->start_str_off = base_btf->hdr->str_len;
+		btf->start_str_off = base_btf->hdr->str_len + base_btf->start_str_off;
 		btf->swapped_endian = base_btf->swapped_endian;
 	}
 
@@ -4176,6 +4176,19 @@ static bool btf_dedup_identical_structs(struct btf_dedup *d, __u32 id1, __u32 id
 	return true;
 }
 
+static bool btf_dedup_identical_ptrs(struct btf_dedup *d, __u32 id1, __u32 id2)
+{
+	struct btf_type *t1, *t2;
+
+	t1 = btf_type_by_id(d->btf, id1);
+	t2 = btf_type_by_id(d->btf, id2);
+
+	if (!btf_is_ptr(t1) || !btf_is_ptr(t2))
+		return false;
+
+	return t1->type == t2->type;
+}
+
 /*
  * Check equivalence of BTF type graph formed by candidate struct/union (we'll
  * call it "candidate graph" in this description for brevity) to a type graph
@@ -4308,6 +4321,9 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
 		 */
 		if (btf_dedup_identical_structs(d, hypot_type_id, cand_id))
 			return 1;
+		/* A similar case is again observed for PTRs. */
+		if (btf_dedup_identical_ptrs(d, hypot_type_id, cand_id))
+			return 1;
 		return 0;
 	}
 
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index bb24f6bac207..1290314da676 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -13971,6 +13971,12 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s)
 		}
 
 		link = map_skel->link;
+		if (!link) {
+			pr_warn("map '%s': BPF map skeleton link is uninitialized\n",
+				bpf_map__name(map));
+			continue;
+		}
+
 		if (*link)
 			continue;