diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
index bf2e5f33312160172942e3e44106251a74692777..13fe032543bc185d22d84118ef8736d726bd46a0 100644
--- a/fsdev/virtfs-proxy-helper.c
+++ b/fsdev/virtfs-proxy-helper.c
@@ -738,6 +738,7 @@ static int proxy_socket(const char *path, uid_t uid, gid_t gid)
         return -1;
     }
 
+    g_assert(strlen(path) < sizeof(proxy.sun_path));
     sock = socket(AF_UNIX, SOCK_STREAM, 0);
     if (sock < 0) {
         do_perror("socket");
diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c
index 6bb191ee6ab8d830a72affc887f078ea835e108d..71b6198bbd22ee1f6ba6e39a2d04759bfba85a69 100644
--- a/hw/9pfs/virtio-9p-proxy.c
+++ b/hw/9pfs/virtio-9p-proxy.c
@@ -1100,6 +1100,10 @@ static int connect_namedsocket(const char *path)
     int sockfd, size;
     struct sockaddr_un helper;
 
+    if (strlen(path) >= sizeof(helper.sun_path)) {
+        fprintf(stderr, "Socket name too large\n");
+        return -1;
+    }
     sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
     if (sockfd < 0) {
         fprintf(stderr, "failed to create socket: %s\n", strerror(errno));