3 files changed, 16 insertions, 4 deletions
diff --git a/tools/bpf/bpftool/cgroup.c b/tools/bpf/bpftool/cgroup.c
index ec356deb27c9..ce69d1e5468e 100644
--- a/tools/bpf/bpftool/cgroup.c
+++ b/tools/bpf/bpftool/cgroup.c
@@ -78,6 +78,13 @@ static unsigned int query_flags;
 static struct btf *btf_vmlinux;
 static __u32 btf_vmlinux_id;
 
+static void free_btf_vmlinux(void)
+{
+	btf__free(btf_vmlinux);
+	btf_vmlinux = NULL;
+	btf_vmlinux_id = 0;
+}
+
 static enum bpf_attach_type parse_attach_type(const char *str)
 {
 	const char *attach_type_str;
@@ -388,6 +395,8 @@ static int do_show(int argc, char **argv)
 	if (json_output)
 		jsonw_end_array(json_wtr);
 
+	free_btf_vmlinux();
+
 exit_cgroup:
 	close(cgroup_fd);
 exit:
@@ -437,7 +446,9 @@ static int do_show_tree_fn(const char *fpath, const struct stat *sb,
 		printf("%s\n", fpath);
 	}
 
-	btf_vmlinux = libbpf_find_kernel_btf();
+	if (!btf_vmlinux)
+		btf_vmlinux = libbpf_find_kernel_btf();
+
 	for (i = 0; i < ARRAY_SIZE(cgroup_attach_types); i++)
 		show_bpf_progs(cgroup_fd, cgroup_attach_types[i], ftw->level);
 
@@ -540,6 +551,7 @@ static int do_show_tree(int argc, char **argv)
 	if (json_output)
 		jsonw_end_array(json_wtr);
 
+	free_btf_vmlinux();
 	free(cgroup_alloced);
 
 	return ret;
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index 993c7d9484a4..bdef69c5e6cd 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -1399,7 +1399,7 @@ static int do_skeleton(int argc, char **argv)
 				continue;
 
 			if (use_loader)
-				printf("t\tint %s_fd;\n", ident);
+				printf("\t\tint %s_fd;\n", ident);
 			else
 				printf("\t\tstruct bpf_link *%s;\n", ident);
 		}
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
index 1a06b0b5eef3..f669716a588b 100644
--- a/tools/bpf/bpftool/net.c
+++ b/tools/bpf/bpftool/net.c
@@ -603,14 +603,14 @@ static int query_flow_dissector(struct bpf_attach_info *attach_info)
 			     &attach_flags, prog_ids, &prog_cnt);
 	close(fd);
 	if (err) {
-		if (errno == EINVAL) {
+		if (err == -EINVAL) {
 			/* Older kernel's don't support querying
 			 * flow dissector programs.
 			 */
 			errno = 0;
 			return 0;
 		}
-		p_err("can't query prog: %s", strerror(errno));
+		p_err("can't query prog: %s", strerror(-err));
 		return -1;
 	}