diff --git a/lib/bpf.c b/lib/bpf.c
index 23cb0d9..c7d4507 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -781,7 +781,11 @@
 		}
 	}
 
-	snprintf(bpf_wrk_dir, sizeof(bpf_wrk_dir), "%s/", mnt);
+	ret = snprintf(bpf_wrk_dir, sizeof(bpf_wrk_dir), "%s/", mnt);
+	if (ret < 0 || ret >= sizeof(bpf_wrk_dir)) {
+		mnt = NULL;
+		goto out;
+	}
 
 	ret = bpf_gen_hierarchy(bpf_wrk_dir);
 	if (ret) {