libbpf: Fix null pointer dereference in btf_dump__free on allocation failure

JIRA: https://issues.redhat.com/browse/RHEL-110274

commit aa485e8
Author: Yuan Chen <chenyuan@kylinos.cn>
Date:   Wed Jun 18 09:19:33 2025 +0800

    libbpf: Fix null pointer dereference in btf_dump__free on allocation failure
    
    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.
    
    Fixes: 351131b ("libbpf: add btf_dump API for BTF-to-C conversion")
    Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Link: https://lore.kernel.org/bpf/20250618011933.11423-1-chenyuan_fl@163.com

Signed-off-by: Viktor Malik <vmalik@redhat.com>

Author: viktormalik

tools/lib/bpf/btf_dump.c

@@ -225,6 +225,9 @@ 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);