Add G_GNUC_PRINTF to function qemu_set_info_str and fix related issues

With the G_GNUC_PRINTF function attribute the compiler detects
two potential insecure format strings:

../../../net/stream.c:248:31: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
    qemu_set_info_str(&s->nc, uri);
                              ^~~
../../../net/stream.c:322:31: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
    qemu_set_info_str(&s->nc, uri);
                              ^~~

There are also two other warnings:

../../../net/socket.c:182:35: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  182 |         qemu_set_info_str(&s->nc, "");
      |                                   ^~
../../../net/stream.c:170:35: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  170 |         qemu_set_info_str(&s->nc, "");

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20221126152507.283271-7-sw@weilnetz.de>

diff --git a/include/net/net.h b/include/net/net.h
index 3db75ff841ffb6afb64c4027be717cece90f1c5e..dc20b31e9fa4fd972550e2a58b28ec2995ac2e1e 100644 (file)
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -177,7 +177,8 @@ ssize_t qemu_send_packet_async(NetClientState *nc, const uint8_t *buf,
 void qemu_purge_queued_packets(NetClientState *nc);
 void qemu_flush_queued_packets(NetClientState *nc);
 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge);
-void qemu_set_info_str(NetClientState *nc, const char *fmt, ...);
+void qemu_set_info_str(NetClientState *nc,
+                       const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]);
 bool qemu_has_ufo(NetClientState *nc);
 bool qemu_has_vnet_hdr(NetClientState *nc);

diff --git a/net/socket.c b/net/socket.c
index 4944bb70d580bc6be1b99345a8b8486c6f21ae00..e62137c8393c37294932255d5f5a746209b319cd 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -179,7 +179,7 @@ static void net_socket_send(void *opaque)
         s->fd = -1;
         net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
         s->nc.link_down = true;
-        qemu_set_info_str(&s->nc, "");
+        qemu_set_info_str(&s->nc, "%s", "");
 
         return;
     }

diff --git a/net/stream.c b/net/stream.c
index 53b7040cc417e91fb87336652e3111e025f9f823..37ff727e0c42fdd514ec853d50f139a8c14bae0f 100644 (file)
--- a/net/stream.c
+++ b/net/stream.c
@@ -167,7 +167,7 @@ static gboolean net_stream_send(QIOChannel *ioc,
 
         net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
         s->nc.link_down = true;
-        qemu_set_info_str(&s->nc, "");
+        qemu_set_info_str(&s->nc, "%s", "");
 
         qapi_event_send_netdev_stream_disconnected(s->nc.name);
 
@@ -245,7 +245,7 @@ static void net_stream_listen(QIONetListener *listener,
     }
     g_assert(addr != NULL);
     uri = socket_uri(addr);
-    qemu_set_info_str(&s->nc, uri);
+    qemu_set_info_str(&s->nc, "%s", uri);
     g_free(uri);
     qapi_event_send_netdev_stream_connected(s->nc.name, addr);
     qapi_free_SocketAddress(addr);
@@ -319,7 +319,7 @@ static void net_stream_client_connected(QIOTask *task, gpointer opaque)
     addr = qio_channel_socket_get_remote_address(sioc, NULL);
     g_assert(addr != NULL);
     uri = socket_uri(addr);
-    qemu_set_info_str(&s->nc, uri);
+    qemu_set_info_str(&s->nc, "%s", uri);
     g_free(uri);
 
     ret = qemu_socket_try_set_nonblock(sioc->fd);