diff --git a/qemu.spec b/qemu.spec
index 981d9e122bb15216d1d717f42c62cd6ace4810fd..00215f52d7ee382e4007729aa4740dcb7a1820db 100644
--- a/qemu.spec
+++ b/qemu.spec
@@ -1,6 +1,6 @@
 Name: qemu
 Version: 4.1.0
-Release: 76
+Release: 77
 Epoch: 2
 Summary: QEMU is a generic and open source machine emulator and virtualizer
 License: GPLv2 and BSD and MIT and CC-BY-SA-4.0
@@ -555,6 +555,7 @@ Patch0542: vfio-Add-vfio_prereg_listener_log_sync-in-nested-sta.patch
 Patch0543: vfio-Add-vfio_prereg_listener_log_clear-to-re-enable.patch
 Patch0544: vfio-Add-vfio_prereg_listener_global_log_start-stop-.patch
 Patch0545: hw-arm-smmuv3-Post-load-stage-1-configurations-to-th.patch
+Patch0546: usbredir-fix-free-call.patch
 
 BuildRequires: flex
 BuildRequires: gcc
@@ -949,6 +950,9 @@ getent passwd qemu >/dev/null || \
 %endif
 
 %changelog
+* Mon Aug 16 2021 Chen Qun <kuhn.chenqun@huawei.com>
+- usbredir: fix free call
+
 * Wed Aug 04 2021 Chen Qun <kuhn.chenqun@huawei.com>
 - vfio: Support host translation granule size
 - vfio/migrate: Move switch of dirty tracking into vfio_memory_listener
diff --git a/usbredir-fix-free-call.patch b/usbredir-fix-free-call.patch
new file mode 100644
index 0000000000000000000000000000000000000000..d4e65ef4e045e87cb61d8b713260715cedb5d79e
--- /dev/null
+++ b/usbredir-fix-free-call.patch
@@ -0,0 +1,38 @@
+From 642ace93283c326666a9bbc2f8cf5b483fca2a6a Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Thu, 22 Jul 2021 09:27:56 +0200
+Subject: [PATCH] usbredir: fix free call
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+data might point into the middle of a larger buffer, there is a separate
+free_on_destroy pointer passed into bufp_alloc() to handle that.  It is
+only used in the normal workflow though, not when dropping packets due
+to the queue being full.  Fix that.
+
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/491
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20210722072756.647673-1-kraxel@redhat.com>
+Signed-off-by: imxcc <xingchaochao@huawei.com>
+---
+ hw/usb/redirect.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
+index 3cf82589ed..71f3594f4a 100644
+--- a/hw/usb/redirect.c
++++ b/hw/usb/redirect.c
+@@ -468,7 +468,7 @@ static int bufp_alloc(USBRedirDevice *dev, uint8_t *data, uint16_t len,
+     if (dev->endpoint[EP2I(ep)].bufpq_dropping_packets) {
+         if (dev->endpoint[EP2I(ep)].bufpq_size >
+                 dev->endpoint[EP2I(ep)].bufpq_target_size) {
+-            free(data);
++            free(free_on_destroy);
+             return -1;
+         }
+         dev->endpoint[EP2I(ep)].bufpq_dropping_packets = 0;
+-- 
+2.27.0
+