usbredirhost: Fix a cancellation corner case

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/usbredirhost/usbredirhost.c b/usbredirhost/usbredirhost.c
index 86e1a92..47ee5e4 100644
--- a/usbredirhost/usbredirhost.c
+++ b/usbredirhost/usbredirhost.c
@@ -1912,7 +1912,9 @@ static void usbredirhost_cancel_data_packet(void *priv, uint64_t id)
 
     LOCK(host);
     for (t = host->transfers_head.next; t; t = t->next) {
-        if (t->id == id) {
+        /* After cancellation the guest may re-use the id, so skip already
+           cancelled packets */
+        if (!t->cancelled && t->id == id) {
             break;
         }
     }