[PATCH spice-server] reds: Do not free wrong agent device

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Do not assume the device passed is the one currently working
but check for it and refuse to free the current one avoiding
possible double free of the device.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/reds.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/server/reds.c b/server/reds.c
index 39a7a31..88ee7d1 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -3201,13 +3201,14 @@ static int spice_server_char_device_add_interface(SpiceServer *reds,
     return 0;
 }
 
-static void spice_server_char_device_remove_interface(RedsState *reds, SpiceBaseInstance *sin)
+static int spice_server_char_device_remove_interface(RedsState *reds, SpiceBaseInstance *sin)
 {
     SpiceCharDeviceInstance* char_device =
             SPICE_CONTAINEROF(sin, SpiceCharDeviceInstance, base);
 
     spice_info("remove CHAR_DEVICE %s", char_device->subtype);
     if (strcmp(char_device->subtype, SUBTYPE_VDAGENT) == 0) {
+        g_return_val_if_fail(char_device == reds->vdagent, -1);
         if (reds->vdagent) {
             reds_agent_remove(reds);
             red_char_device_reset_dev_instance(RED_CHAR_DEVICE(reds->agent_dev), NULL);
@@ -3226,6 +3227,7 @@ static void spice_server_char_device_remove_interface(RedsState *reds, SpiceBase
     }
 
     char_device->st = NULL;
+    return 0;
 }
 
 SPICE_GNUC_VISIBLE int spice_server_add_interface(SpiceServer *reds,
@@ -3360,7 +3362,7 @@ SPICE_GNUC_VISIBLE int spice_server_remove_interface(SpiceBaseInstance *sin)
         SpiceCharDeviceInstance *char_device = SPICE_CONTAINEROF(sin, SpiceCharDeviceInstance, base);
         g_return_val_if_fail(char_device->st != NULL, -1);
         reds = red_char_device_get_server(char_device->st);
-        spice_server_char_device_remove_interface(reds, sin);
+        return spice_server_char_device_remove_interface(reds, sin);
     } else if (strcmp(interface->type, SPICE_INTERFACE_QXL) == 0) {
         QXLInstance *qxl;
 
-- 
2.9.3

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