From: chenyuan <chenyuan@kylinos.cn>
When btf_dump__new() fails to allocate memory for the internal hashmap
(btf_dump->type_names), it returns an error code. However, the cleanup
function btf_dump__free() does not check if btf_dump->type_names is NULL
before attempting to free it. This leads to a null pointer dereference
when btf_dump__free() is called on a btf_dump object.
Fix: 351131b51c7a ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: chenyuan <chenyuan@kylinos.cn>
---
tools/lib/bpf/btf_dump.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 7c2f1f13f958..f09f25eccf3c 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -227,6 +227,9 @@ static void btf_dump_free_names(struct hashmap *map)
size_t bkt;
struct hashmap_entry *cur;
+ if (!map)
+ return;
+
hashmap__for_each_entry(map, cur, bkt)
free((void *)cur->pkey);
--
2.25.1