diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 2c2bdaa86aa7..35d1f1428ef3 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1936,8 +1936,8 @@ int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
 
 	kfree(ctx.cur_val);
 
-	if (ret == 1 && ctx.new_updated) {
-		kfree(*buf);
+	if (!ret && ctx.new_updated) {
+		kvfree(*buf);
 		*buf = ctx.new_val;
 		*pcount = ctx.new_len;
 	} else {
@@ -2343,6 +2343,7 @@ BPF_CALL_3(bpf_sysctl_set_new_value, struct bpf_sysctl_kern *, ctx,
 		return -E2BIG;
 
 	memcpy(ctx->new_val, buf, buf_len);
+	((char *)ctx->new_val)[buf_len] = '\0';
 	ctx->new_len = buf_len;
 	ctx->new_updated = 1;